NOVELTY - Sulfur containing gamma -biological nitrogen fertilizer comprises gamma -polyglutamate, straw extract, microbial agents and nitrogen elements. The gamma -polyglutamate and microbial agents are produced by fermentation, extraction and processing of straw extract and tender shoots. The nitrogen elements are urea and ammonium sulfate. Sulfur containing gamma -biological nitrogen fertilizer contains gamma -polyglutamic acid (0.1-5.0 pts. wt.), straw extract (2-20 pts. wt.), microbial agents (2-8 pts. wt.), where bacterial content is 2 billion per gram, urea (40-60 pts. wt.) and ammonium sulfate (15-35 pts. wt.).    USE - Sulfur containing gamma - biological nitrogen fertilizer.    ADVANTAGE - The sulfur containing gamma - biological nitrogen fertilizer increases nitrogen utilization rate, plant disease resistance and crop anti-interference ability, improves soil micro-environment and crop yield, and promotes nutrition absorption.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method for preparing gamma -polyglutamate powder, which involves preparing Bacillus licheniformis and Bacillus subtilis fermented broths at controlled temperature, pH, stirring speed and ventilation conditions; fermenting the broth to obtain gamma -polyglutamic acid; adding diatomite to the fermented broth; frame-filtering the fermented broth to remove cells and to obtain supernatant; adding ethanol to supernatant to precipitate gamma -polyglutamate; washing the obtained precipitate; dissolving the washed precipitate in deionized water to obtain gamma -polyglutamic acid solution; and spray-drying the obtained gamma -polyglutamic acid solution to obtain gamma -polyglutamate powder, where concentration of gamma -polyglutamate powder is 10-40 wt.%, preferably 12-22 wt.% and average molecular weight is 200-3000 kilo-daltons; and    (2) a method for preparing sulfur containing gamma - biological nitrogen fertilizer, which involves crushing and sieving urea and ammonium sulfate to 200-300 meshes standby; mixing the crushed mixture with gamma -polyglutamate powder and straw extract powder; adding the obtained mixture in three-dimensional mill; adding microbial agents to the obtained mixture; mixing the obtained mixture in drum mixer to obtain sulfur containing gamma - biological nitrogen fertilizer, which is added to automatic packaging machine for packaging.