The automatic pressure subsoil application gun for chemical fertilizer consists of handle, guide bar, guide bar spring, sliding bush, plug-stick, leather cup, sleeve barrel, intake ball valve, delivery ball valve, inserting bar and depth-fixing plate. It is characterized by that its handle is equipped with guide bar and sliding bush with slideway, the guide bar is placed in the guide bar bush, and between the guide bar bush and the handle the guide bar spring is placed, and when the handle is pressed, the suction and pressure can be produced in the sleeve barrel to inject the liquid chemical fertilizer into the soil according to the requirements intermittently, accurately and quantitatively.

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