The invention discloses a method for preparing a porous material of a slow-release degradable film wrapped medicine fertilizer. The method comprises the following steps: crushing plant ash, soaking the plant ash into a wall breaking agent and a plus pore agent, and performing ammoniation and carbonization so as to obtain a porous material; soaking the porous material into a pesticide solution, andperforming ultrasonic dispersion so as to obtain a pesticide supported porous material; performing water bath heating on wheat bran and starch, sequentially adding a modification aid, a plasticizer,distilled water, a film formation aid and the pesticide supported porous material, and performing uniform stirring so as to obtain a wrapping slow-release degradable film; and drying and screening powder of the wrapping slow-release degradable film, so as to obtain the porous material of the slow-release degradable film wrapped medicine fertilizer. By adopting the method, the long lasting effect of a medicine is efficiently maintained, degradable environment-friendly raw materials are prepared into the slow-release film to control release and viscosities of medicines, an adsorption carrier canalso function as a fertilizer to take effects into play after the slow-release film is broken, an effect of long-lasting and slow release of medicine fertilizers can be achieved, and the applicationtimes of the medicine fertilizers can be reduced.