The invention discloses an electric multiple unit transmission system axle box bearing six-degree-of-freedom dynamic simulation load test platform and aims to overcome a problem that an electric multiple unit transmission system axle box bearing reliability test can be not carried out in a practical operation. The test platform comprises a power transmission torque detection testing device, a T type beam assembly body and a test piece assembly body. The T type beam assembly body is installed in the middle of a ground base. The power transmission torque detection testing device is installed at the left side of the T type beam assembly body, and the power transmission torque detection testing device is connected with the T type beam assembly body through a cross shaft type universal shaft coupler. The test piece assembly body is installed at the ground base above the T type beam assembly body. A simulated frame side beam supporting platform in the test piece assembly body and an upper surface of a rectangle bearing platform in the power transmission torque detection testing device are on the same horizontal plane, the simulated frame side beam supporting platform in the test piece assembly body is lower than an upper surface of a vibration T type beam for 50 mm, and the upper end of the vibration T type beam is parallel with the simulated frame side beam supporting platform.