The invention discloses an auxiliary device for an automatic switching test of a standby power supply, and the device comprises a metal box, wherein the interior of the metal box is fixedly provided with an insulating plate. The insulating plate is fixedly provided with a relay unit and a binding post unit. The relay unit comprises a plurality of units which are arranged at one side of the insulating plate at equal intervals. The binding post unit comprises a plurality of binding posts which are arranged at the other side of the insulating plate at equal intervals, wherein the number of groups is the same as the number of the relays. Each group of binding posts comprise a normally-opened binding post, a normally-closed binding post, and a relay binding post. The normally-opened binding posts are respectively connected with a normally-opened connection point of the relay unit, and the normally-closed binding posts are respectively connected with a normally-closed connection point of the relay unit. The relay binding posts are respectively connected with an excitation coil connection point of the relay unit. The device improves the efficiency and reliability of the automatic switching test of the standby power supply, reduces the impact on a test result from uncertain factors, and can meet the testing demands of automatic switching devices of standby power supplies at different voltage levels.