The utility model discloses a breaker performance testing device. The device comprises a voltage regulator which is used for controlling the voltage input into an upflow transformer, the input end ofthe voltage regulator is connected with a power supply module, and the output end of the voltage regulator is connected with the upflow transformer; and the time relay is used for controlling the on-off of the test loop in a time-delay manner, and the test loop is a loop formed by connecting the time relay, the current-rising transformer and the to-be-tested circuit breaker in series. According tothe utility model, the problems of tedious test process and inaccurate test result when the tripping performance of the circuit breaker is manually tested in the prior art are solved.