Pesticide spraying device for grain planting

The utility model provides a pesticide spraying device for grain planting, which relates to the field of grain planting and comprises a pesticide spraying tank, a base is arranged at the bottom of the pesticide spraying tank, a first wheel and a second wheel are arranged at the bottom of the base, a second motor is fixedly connected to the bottom of the base, and a screw is movably connected to the top of the second motor. The top of the screw rod is movably connected with the inner wall of the base, the surface of the screw rod is in threaded connection with a threaded sleeve, the two sides of the threaded sleeve are fixedly connected with connecting rods, one end of each connecting rod is movably connected with a movable rod, and the screw rod is driven to rotate through operation of a second motor, so that the threaded sleeve moves up and down on the surface of the screw rod; when the connecting rod moves downwards, the right end of the connecting rod drives the movable rod to do circular motion around the