NOVELTY - Microbial bacteria with fermentative alkali function comprises bacterial strain HNPY23, which is Bacillus subtilis (CGMCC 10069), where the bacterial strain HNPY23 shape and physiological and biochemical characteristics is as follows: Bacillus subtilis is Gram-positive bacteria, cell is rod-shaped, can produce spore, has quick growing speed in lysogeny broth (LB) agar flat plate, circular bulge colonies (37 degrees C, growth of 48 hours), cream color opaque, colony diameter of 3-6 mm; cell is rod shape, size is 3.5-4.5x 1. 8 mu m, weak flagella.    USE - The microbial strain is used in microbial organic fertilizer for lettuce cultivation (claimed).    ADVANTAGE - The microbial strain solves over-farming soil acidification problem, can survive and grow in adversity, is capable for providing plant enzyme and increase soil microorganism diversity, can optimize the fine adjustment acid soil crop rhizosphere ecology, can significantly promote the lettuce and other crops acidic soil tolerance, improves soil urease activity, improves lettuce and other crops leaf tissue chlorophyll content, vitamin C content of leaves, and increases quality and yield.    DETAILED DESCRIPTION - Microbial bacteria with fermentative alkali function comprises bacterial strain HNPY23, which is Bacillus subtilis (CGMCC 10069), where the bacterial strain HNPY23 shape and physiological and biochemical characteristics is as follows: Bacillus subtilis is Gram-positive bacteria, cell is rod-shaped, can produce spore, has quick growing speed in lysogeny broth (LB) agar flat plate, circular bulge colonies (37 degrees C, growth of 48 hours), cream color opaque, colony diameter of 3-6 mm; cell is rod shape, size is 3.5-4.5x 1. 8 mu m, weak flagella, the optimal growing temperature is 37 degrees C and optimal growing pH value is 6-8, facultative anaerobic, Gram-positive, oxidase is negative, catalase is positive; modified bacterial strain fermentation production alkali in LB liquid medium, pH value of the fermentation liquid is increased to more than pH 8; Tween-80 (RTM: Polysorbate 80), D-arabinose, L-arabinose, D-galactose, L-fructose, D-cellobiose, D-raffinose, L-rhamnose, xylose, D-xylose, D-turanose, D-ribose, mannitol, inositol, galactitol, adonitol, sebacic acid, hydroxy acid, sodium succinate, L-malic acid, L-glutamic acid, L-lysine, L-proline, and L-histidine as culture medium carbon source for growth; the growth pH range is wide, resistant to pH 3-10, sensitive to sodium chloride, can grow in less than 1% sodium chloride concentration; has tolerance to 100 mu g/ml streptomycin, tetracycline, and erythromycin, and poor tolerance to kanamycin, chloramphenicol, neomycin, ampicillin, and gentamicin antibiotic low concentration of 50 mg/ml can restrain the growth, the indole reaction is positive, can secrete growth hormone indole acetic acid, and can liquefy gelatin. An INDEPENDENT CLAIM is also included for use of microbial strain in microbial organic fertilizer, where the bacterial strain HNPY23 content is more than 1x 108 colony forming unit (cfu)/g, total nitrogen mass ratio is 3-7%, total nitrogen potassium nutrient mass ratio is 5-11%, organic matter content mass is not less than 40%.