Pure organic biological growth induction factor

The invention discloses a pure organic biological growth induction factor comprising the following raw materials: various beans, corns, potatoes, leafy vegetables, straws and a penthorum Chinese pursh extract. A preparation method of the pure organic biological growth induction factor comprises the following steps: uniformly mixing the raw materials in proportion, completely dipping in warm water, crushing, filtering, removing slags to obtain slurry, naturally precipitating, adding obtained precipitates into a weakly-acidic buffer solution, then adding plant protease to perform fermentation at 16-32 DEG C, adsorbing fermentation liquor obtained through fermentation by using a cationic adsorbent, adjusting the pH value to be 5.3-7.5, then eluting functional small molecular substances on the adsorbent, concentrating an eluent, and then performing spray-drying to obtain the pure organic biological growth induction factor.