Modularized permanent magnet induction type limit switch

A modularized permanent magnet induction type limit switch disclosed by the present invention comprises an upper cover, an induction disc assembly, a permanent magnet switch module group, a base and a transparent cover, the induction disc assembly and the permanent magnet switch module group are installed in the base, a fourth sealing ring is arranged at the joint of the base and the upper cover, and the transparent cover is fixedly installed below the base. A shaft sleeve is installed at the lower end of the induction disc assembly, and the induction disc assembly penetrates through the shaft sleeve and then is connected with a lower clamping spring and a middle clamping spring. Maintenance and debugging are achieved, an on-site indicator and remote signal output are provided, on-site or remote observation of the opening and closing state of the valve is facilitated, according to the principle that like poles repel and unlike poles attract of magnets and the magnitude of magnetic force, a switch is triggered