Biogas fermentation device for preparing fruit tree planting fertilizer

The utility model relates to the field of fermentation devices. The utility model relates to a biogas fermentation device for fruit tree planting fertilizer preparation. Including a base, an outer tank body is fixedly arranged at the upper end of the base; an inner tank body is fixedly arranged in the outer tank body; a thermometer is arranged on the outer side of the outer tank body, a feeding pipe opening and a spraying pipe opening are formed in the two sides of the upper end of the inner tank body respectively, a motor is fixedly arranged at the top of the inner tank body, a stirring shaftis longitudinally and rotationally arranged in an inner cavity of the inner tank body, and the power output end of the motor movably penetrates through the top of the inner tank body and then is fixedly connected with the upper end of the stirring shaft. According to the utility model, the surface of the inner tank body is heated through the electric heating wire arranged in the outer tank body;the stirring rods uniforml