Pesticide spraying device

The utility model belongs to the technical field of agricultural machinery, and particularly relates to a pesticide spraying device, which solves the problems of lower spraying efficiency and poorer practicability, and comprises a movable seat and an observation component, a motor is mounted in the movable seat, and the output end of the motor is fixedly connected with a transmission shaft which is coaxially arranged through a coupler; the outer peripheral surface of the transmission shaft is fixedly sleeved with a stirring blade, the outer peripheral surface of the transmission shaft is fixedly sleeved with a half gear, the top of the movable seat is fixedly connected with a pesticide box through a screw, and through arrangement of a crank, a movable plate and other structures, a motor is started, the transmission shaft rotates and the half gear rotates, so that the crank moves leftwards and rightwards; the movable plate is driven by the connecting rod to move up and down, so that the spray head automaticall