The invention relates to a flow control valve, specifically relates to a flow valve realizing complex speed reduction through a specially-shaped helical gear and a worm, and solves the problems that an existing flow valve is limited by a spatial structure and low in cost. The following scheme is adopted: the flow valve realizing complex speed reduction through the specially-shaped helical gear andthe worm comprises a valve body, wherein a counter bore is formed in the valve body, a piston rod counter bore is formed in the bottom, a piston rod is arranged in the piston rod counter bore, and aspring is supported at the lower end of the piston rod; an oil absorption port and an oil drainage port which are connected with the piston rod counter bore are formed in the side surfaces of the valve body; the specially-shaped helical gear fixedly sleeves the upper end of the piston rod, the specially-shaped helical gear is encircled by 2n outer remote helical-tooth-shaped fan-shaped gear sheets, and one half of the gear sheets are bulged towards one axial end; and the worm matched with the specially-shaped helical gear further penetrates into the valve body, a bypass hole is formed in a valve cover, and a top pin is supported on the valve cover. The flow valve realizing complex speed reduction through the specially-shaped helical gear and the worm has the following advantages: 1. the flow valve is compact in space structure; 2. the flow valve meets the needs of speed reduction movement and reciprocating movement simultaneously, thereby controlling the flow-out amount of a lubricant;and 3. the flow valve is simple in structure, small in micro dimensions, and convenient to machine, assemble and debug.