The invention relates to a rail vehicle curve passage capacity testing method which includes the following steps that (A) trains to be tested are placed on test platforms; (B) according to test requirements, weight balancing equipment with the corresponding weight is arranged in the trains so that bodies of the trains can meet a needed state requirement; (C) whether the two trains to be tested interfere with each other is detected in an initial state; (D) multiple vertical excitation devices and transverse excitation devices are controlled to move a certain distance in the vertical direction and the transverse direction by testing needed track line conditions, so that center lines of the four test platforms are not in the forwarding direction of the trains, and a curve and a superelevation of an actual line are simulated; (E) according to displacement values obtained through testing, a curve radius is obtained through conversion, whether the two trains to be tested interfere with each other in the monitoring process is detected, meanwhile, wheel rail transverse force Y and wheel rail vertical force Q of each wheel are recorded, and accordingly the curve passage capacity of the trains is analyzed. The method can simulate different line curve situations according to actual situations, is low in cost, high in efficiency, and capable of testing on different track situations and in different vehicle states.