Plugging module of surge protector

The utility model provides a plugging module of a surge protector. The surge protector comprises a machine seat which can be fixed on a rail, and the plugging module which can be inserted in the machine seat. The plugging module comprises a cover shaped module shell; and a first printed circuit board and a second printed circuit board which are disposed parallelly in the module shell in an opposite manner, wherein a necessary electric leakage distance and a necessary air distance are disposed between the first printed circuit board and the second printed circuit board, and the first printed circuit board and the second printed circuit board are respectively provided with a pawl sheet which is connected with a connection terminal; and a module bottom cover, which is inserted at a bottom end of the module shell, and which is provided with positioning grooves which are used for fixing the first printed circuit board and the second printed circuit board, and for allowing the pawl sheets of the first printed circu