The invention relates to a clutch leakage test device and test method and belongs to the field of transmission test. The device comprises an oil tank, an oil inlet pipe, a test device, a solenoid valve, a heating device and a computer. The oil tank is connected with the heating device through the oil inlet pipe; the heating device is connected with the solenoid valve through a pipeline; the solenoid valve is connected with the test device through a pipeline; the test device is connected with the oil tank through a pipeline; and the computer controls connection and disconnection of the solenoidvalve. A detected clutch is placed on a test platform, and leakage is measured in the rotation process; pressure is controlled accurately to enable the measurement environment to be similar with thereal working environment of the detected clutch; the device and method realize combination of various oil temperature and oil pressure and rotation speed, and can fully test leakage under various working conditions by simulating actual working conditions of the clutch in a transmission. The device and method finish leakage measurement of the clutch, and the result is true and reliable.