PCB circuit testing device

The utility model discloses a PCB circuit testing device which comprises a box body and a panel, the panel is installed on the box body close to the upper end of the right side, a storage groove is formed in the box body close to the upper end of the left side, four connectors are arranged on the panel close to the upper end of the left side at equal intervals, and a display screen is arranged on the right sides of the four connectors. Three control buttons are arranged on the lower side of the display screen at equal intervals, a power socket is formed in the position, close to the upper end of the right side, of the panel, and an on-off key is arranged on the lower side of the power socket, only one part of an external circuit needs to be placed in a sliding groove A, and the inner wall of the sliding groove A can be tightly attached to the outer wall of the external circuit; therefore, when an operator uses the testing device, the external circuit connected with the connector is not influenced by external