The invention discloses a pesticide spraying device for a seedling field. The device comprises a base, wherein a storage battery is arranged at the bottom of an inner cavity of the base, a vertical bar, a pesticide box, a water pump and a fixing frame are fixedly connected to the top of the base from left to right sequentially, a controller is arranged on the left side of the vertical bar, a motor is fixedly connected to the top of the pesticide box, a rotating shaft is fixedly connected to an output end of the motor, and the bottom of the rotating shaft penetrates to the inner cavity of the pesticide box. According to the device, by cooperative application of the base, the storage battery, a tube cap, a pesticide injecting tube, the motor, the controller, the rotating shaft, a mixing rod and the pesticide box, the problem that pesticides cannot be mixed sufficiently by an existing pesticide spraying device for the seedling field is solved; the pesticide spraying device for the seedling field has the advantages that the pesticides can be mixed sufficiently, the pesticide spraying effect is prevented from being affected by uneven mixing of pesticide liquid, usage is facilitated for a user, and efficiency of the existing pesticide liquid spraying device is improved.