The invention discloses a flexible support platform for vehicle body static strength test of a railway vehicle. The platform comprises a side frame assembly, a sleeper frame assembly, wheel axle connection rods and balance weight brackets, wherein the side frame assembly comprises a side frame main body, wheel axle end covers and a wheel groove, and is symmetrically arranged at bottoms of two endsof the sleeper frame assembly; the sleeper frame assembly comprises a sleeper frame main body, a jacking and weighing assembly and simulative side bearings, two ends of the sleeper frame main body are connected with a middle top of the side frame main body through bolting, the jacking and weighing assembly is arranged at the middle part of the sleeper frame main body, the simulative side bearingsare symmetrically arranged at two ends of the sleeper frame main body, and transverse space and vertical height of the simulative side bearing can be adjusted and fixed through a provided locating hole; the wheel axle connection rods are symmetrically arranged at two sides of the sleeper frame assembly, two ends of each wheel axle connection rod are provided with a wheel group and are connected with the side frame main body through wheel axle end covers; and the balance weight brackets are symmetrically arranged at two sides of the sleeper frame assembly, and two ends of each balance weight bracket are connected with the side frame main body through bolting. The flexible support platform for vehicle body static strength test of the railway vehicle, provided by the invention, is simple instructure and highly universal, and can substitute various railway vehicle bogies to support a tested vehicle body and perform static strength test.