The utility model relates to an environment-friend magnetic encryption pipe plastic gate valve, belonging to the pipe equipment technical field, which is composed of a valve body (1) and a transmission component, wherein the plastic valve body (1) is embedded with a reinforce ring (11), two interface ends of the valve body (1) are arranged with internal screws (13), the transmission component is composed of a valve plate (2), a valve cover (3), a valve rod (4), a transmission block (5), an upper magnetic steel (10), a lower magnetic steel (12), a sleeve (6) and a tool (7), the valve cover (3) is sheathed on the upper end of the valve body (1) via a screw connection, the sleeve (6) is embedded and flipped on the valve cover (3). In a chamber formed by the sleeve (6), the valve cover (3) and the valve body (1), the transmission block (5), the valve rod (4) and the valve plate (2) are arranged from up to down, wherein the transmission block (5) is geared and connected with the valve rod (4), the valve rod (4) is connected with the valve plate (2) via screws, the chamber formed by the transmission block (5) and the valve rod (4) is provided with a spring (9), the tool (7) is flipped on the sleeve (6), the tool (7) and the transmission block (5) are respectively arranged with the upper magnetic steel (10) and the lower magnetic steel (12) whose north and south polarities are correspondingly arranged.