The invention discloses a test platform for calibrating an ultrasonic partial discharge tester. The test platform comprises a plate type base, an emission vibrator, supporting rods and a carrying plate, wherein the plate type base is positioned at the bottom of the tester; the emission vibrator is used for emitting ultrasonic waves is arranged on the base; a sensor to be tested is arranged at the top of the emission vibrator; the supporting rods are fixed at the edge of the base; the carrying plate is horizontally and fixedly arranged at the top ends of the supporting rods; a rotary lifting device is arranged at the bottom of the carrying plate; a pressure sensor is fixedly mounted at the bottom end of the lifting device, and is connected with a pressure gauge; the bottom of the lifting device can provide compaction force for the sensor to be tested. Due to downward movement of the lifting device, the sensor to be tested on the emission vibrator can be compacted; meanwhile, as the lifting device can move continuously, continuous pressure can be provided for the sensor to be tested; therefore, a displayed value on the pressure gauge can be continuously adjusted according to an actual requirement. Compared with the original mode for applying pressure with weights, the phenomenon that the sensor moves or the weights fall down due to mis-touch of an operator on a conductor is avoided.