The present invention discloses a test method and a test device, and the test method comprises setting a series of voltage values which are a first voltage value, a second voltage value, ..., a (N-1)th voltage value, an Nth voltage value from small to big, providing test voltages to a liquid crystal display panel, wherein, the test voltages are the Nth voltage value, the first voltage value, the (N-1)th voltage value, the second voltage value, ...; measuring a transmittance rate of the liquid crystal display panel under the test voltage value respectively. Under the function of the test voltage, liquid crystal molecules are alternately symmetric and deflected for/backward, deformation of the liquid crystal molecules can be recovered in a short time, data test error can be reduced, accuracyof a VT curve can be improved, and data with higher precision can be provided for Gamma tuning.