Timed and constant-pressure automatic chemical fertilizer spraying equipment for plant planting

The utility model discloses a plant cultivation timing constant pressure automatic chemical fertilizer spraying device, which comprises a main box body, the inside of the main box body is composed of a uniform mixing chamber and a storage chamber, two sides of the top of the main box body are respectively welded with a first installation box and a second installation box, and the bottom of the storage chamber is provided with a pressure pump. A liquid outlet of the pressure pump is communicated with a liquid outlet hose, the liquid outlet hose extends into the second mounting box and is stacked in the second mounting box, a notch is formed in the top of the second mounting box, the top end of the liquid outlet hose extends out of the notch and is provided with a spray head, and a lifting mechanism for driving the spray head to ascend and descend is arranged in the second mounting box. A filter screen is vertically inserted into one side, close to the uniform mixing chamber, in the storage chamber, a uniform m