a connecting rod part extends from one side of the positioning seat (3); inner side of the connecting rod part is provided with a guiding groove (32); side walls of the guiding groove (32) are provided with a convex part (34); a guiding shaft (33) is provided at both ends of the connecting rod part; a lower end of the cross-arm plastic spring is inserted into the guiding groove (32), and the cross-arm plastic spring can be pressed along an end of the convex part (34); a cross arm of the cross-arm plastic spring abuts against the inner side of the handle (1); the guiding shaft (33) is rotatably connected to the handle (1);

a lower end of the nozzle mechanism (4) is provided with a spray boom (41); sliders (42) at both sides of the spray boom (41); an upper end of each slider (42) is also provided with an arc-shaped rotating part (43); an arc-shaped groove (102) is provided on the handle (1) at a position corresponding to the arc-shaped rotating part (43);

an upper end of the piston mechanism (7) is connected to the spray boom (41), and a lower end of the piston mechanism is connected to a piston seat (11); the environment friendly plastic upper spring (6) is sleeved on the upper end of the piston mechanism (7); the hexagonal plug (5) is sleeved outside the environment friendly plastic upper spring; an upper end of the environmentally friendly plastic lower spring (8) is connected to the lower end of the piston seat (11); the hexagonal plug (5), the piston mechanism (7), the environmentally friendly plastic upper spring (6), and the environmentally friendly plastic lower spring (8) are all arranged in the cavity of the pump body (10); the plastic ball (9) is located between the environmentally friendly plastic lower spring (8) and the pump body (10).