Easy-testing joint device for charger

The utility model discloses an easy-testing joint device for a charger, which comprises a power supply protection case (1). The power supply protection case (1) is internally provided with two sets of electric leakage protection air switches (5), wherein the upper end of one set of the electric leakage protection air switches is connected with a three-phase four-wire upper terminal (6-1), and the lower end is connected with a three-phase four-wire lower terminal (6-2). The upper end of the other set of electric leakage protection air switches is connected with a single-phase upper terminal (6-3), and the lower end is connected with a single-phase lower terminal (6-4) through a lead. The easy-testing joint device has functions of realizing testing for chargers one by one on condition that a master power supply for the chargers is not switched off, reducing operation risk, ensuring high personnel safety, optimizing operation flow, simultaneously greatly improving operation efficiency, and ensuring stable output of a DC system and safe system operation.