The invention provides a wireless performance test method and a wireless performance test system which are applied to a drive test system comprising a wireless network subsystem and a channel characteristic and QoS test subsystem. A power divider is added in the channel characteristic and QoS test subsystem. The method comprises the following steps: a power divider divides signals received by a receiving antenna into two paths of signals and respectively outputs the two paths of signals to a sweep generator and an access terminal, so that the sweep generator and the access terminal carry out data acquisition; and the test equipment acquires the data acquired by the sweep generator and the access terminal to perform wireless performance analysis. The method can improve the accuracy of the wireless performance test on the premise of ensuring the consistency of the signals received by the sweep generator and the test terminal from the base station.