The invention discloses a wireless roaming function test system and method of an enterprise network. The system comprises an enterprise network to be tested; two shielding boxes respectively used for placing two APs of the enterprise network; two RF adjustable attenuator groups respectively connected with the two APs for receiving signals sent by the APs and performing signal intensity adjustment on the signals; an interface switching device used for electrically connecting the two RF adjustable attenuator groups with one test device; and the test device which is a device comprising a PCIE network card and is used for initializing the two RF adjustable attenuator groups, and according to respectively adjusted signal intensity values of the RF adjustable attenuator groups, simulating conditions of the signals changing with distances, sent by the APs in actual environment so as to test validity of a wireless roaming function. Through such a technical means, the disadvantage in the prior art is solved that testing requires real erection of test environment.