Proximity switch capable of externally adjusting action distance

The utility model provides a proximity switch capable of externally adjusting an action distance. The proximity switch comprises a shell, a circuit module is arranged in the shell, one end of the shell is provided with an inductive head, and the other end is provided with a rear plug; the circuit module is connected with the inductive head, and an output signal of the circuit module is connected with the rear plug; the circuit module is provided with a precision adjustable potentiometer, and the precision adjustable potentiometer is provided with a screw adjusting port. According to the utility model, the precise adjustable potentiometer is added on the basis that the action distance cannot be adjusted after the conventional circuit module is encapsulated, so that the efficiency of debugging the action distance can be improved, and the damage to a PCB (Printed Circuit Board) caused by multiple desoldering of chip resistors can be reduced; according to the utility model, the switch is additionally provided wit