The invention discloses a high-
polymer-material external spring spray gun, which comprises a gun body, a lower cover case and a
handle, wherein the front end of the
handle is connected with a
piston cylinder, a
piston is matched in the
piston cylinder, the front end of the gun body is fixedly connected with a
carding head through a head cap, the upper end of a trigger is provided with a reverse bent hook to realize
lap joint with a concave pit formed in the middle part of the gun body, the middle part of the trigger is connected with an ejecting rod, the end part of the ejecting rod is provided with a lug boss and is rotationally connected with a concave
mortar of the piston, a U-shaped spring is adopted, the
branch end part of the spring is propped and pressed in a sunk pit formed in the back side of the trigger, the bottom of the spring is positioned outside the
piston cylinder and is propped at the upper end of the
handle, the bottom of the handle is connected with a
bottle cap and a
bottle, a sucking
pipe is arranged in the
bottle, the top of the
bottle cap is connected with a marble seat, the marble seat is provided with a center step hole, the upper end of the sucking
pipe is connected with the lower section of the center step hole, an upper end opening of the sucking
pipe is a marble seat hole, a marble covers the marble seat hole in a separable way, the top of the marble sea is provided with a rib, the upper section of the center step hole is connected with the bottom of the
piston cylinder, a passage is formed in the bottom of the
piston cylinder and is communicated with the center through hole of the gun body, the front end of the through hole corresponds to the
carding head, a gap is formed between the front end of the through hole and the
carding head, and a
thin sheet is arranged in the gap and movably covers the center through hole. The high-
polymer-material external spring spray gun is used for products such as domestic gardening products.