The invention discloses a biological pesticide screening machine, and relates to the technical field of biological pesticides. The biological pesticide screening machine comprises a box. A heat dissipating fan is fixedly connected to the bottom of the inner wall of the left side of an inner cavity of the box, and the outer surface of a rotary shaft is fixedly connected with a driving gear; a driven belt pulley is fixedly connected to the position, in an inner cavity of a protecting support, of the outer surface of the rotary shaft; the output end of a screening motor is fixedly connected witha driving belt pulley through a coupling, and the positions, on the side, away from the heat dissipating fan, of a supporting support, of the bottom of the inner cavity of the box are fixedly connected with a first transferring device and a second transferring device correspondingly; and the top of the driving gear is provided with a screening tube in an engagement transmission mode, and the position, on the right side of a fixing top frame, of the top of the inner cavity of the box is fixedly connected with an adsorption device. According to the biological pesticide screening machine, mechanical screening can be carried out, manual screening is avoided, the labor intensity is lowered, the efficiency is improved, batch production and flow dividing conveying can be carried out, machining ofthe next step is facilitated, machining dust is adsorbed to be prevented from harming personal safety, and the environment is protected.