NOVELTY - Method for preparing photosynthetic bacterial fertilizer, involves respectively activating Ectothiorhodospira shaposhnikovii and Rhodocyclus tenuis, subculturing the E.shaposhnikovii using liquid culture medium (A), subculturing the R.tenuis using liquid culture medium (B), inoculating obtained seed liquid of E.shaposhnikovii and seed liquid of R.tenuis into fermentation culture medium, performing culturing process, and filling and packaging obtained product.    USE - The method is useful for preparing photosynthetic bacterial fertilizer (claimed).    ADVANTAGE - The method prepares fertilizer which improves disease resistance of plants, leaves no residue, exhibits stable effect, and improves growth rate of E.shaposhnikovii and R.tenuis within short period of time.    DETAILED DESCRIPTION - Method for preparing photosynthetic bacterial fertilizer, involves (a) activating Ectothiorhodospira shaposhnikovii by culturing the E.shaposhnikovii using semi-solid culture medium at 25-30 degrees C for 7-10 days under light, (b) activating Rhodocyclus tenuis by culturing the R.tenuis using culture medium at 25-35 degrees C for 3-5 days, (c) subculturing the E.shaposhnikovii using liquid culture medium (A) at 25-35 degrees C for 7-10 days under anaerobic conditions, where illumination is provided at an intensity of 1000-3000 lx during subculturing process to obtain seed liquid, where 1 ml seed liquid comprises containing greater than or equal to 600 million colony-forming units (CFU) of E.shaposhnikovii, (d) subculturing the R.tenuis using liquid culture medium (B) at 25-35 degrees C for 3-5 days, where illumination is provided at an intensity of 1000-3000 lx during subculturing process to obtain seed liquid, where 1 ml seed liquid comprises containing greater than or equal to 400 million CFU of R.tenuis, (e) inoculating seed liquid of E.shaposhnikovii into fermentation culture medium, then inoculating seed liquid of R.tenuis into the fermentation culture medium, performing culturing process at 25-35 degrees C and 120 revolutions/minute (rpm) for 3-5 days under anaerobic conditions, providing illumination at an intensity of 1000-4000 lx during culturing process, adding 300 g/l sodium thiosulfate solution to the fermentation culture medium during third day, and performing culturing process until viable count of the E.shaposhnikovii and R.tenuis reaches not less than 2.5 billion CFU/ml and not less than 2 billion CFU/ml, where the ratio of seed liquid of E.shaposhnikovii and fermentation culture medium is 1:3-1:5, and the ratio of seed liquid of R.tenuis and fermentation culture medium is 1:6-1:10, and (f) filling and packaging obtained product.