Dynamic braking device and method for multi-degree-of-freedom motion simulation platform

The invention relates to a dynamic braking device and method for a multi-degree-of-freedom motion simulation platform. The dynamic braking device comprises a PLC motion controller, an uninterruptible power supply (UPS) and a plurality of first contactors arranged corresponding to a plurality of motion execution mechanisms. The UPS is used for supplying power to the PLC motion controller; the first contactor is connected between the servo driver and the UVW end of the servo motor; and the PLC motion controller is connected with the control end of the first contactor, and is used for cutting off the connection between the servo driver and the UVW end of the servo motor and connecting the UVW end of the servo motor in parallel when the motion simulation platform is shut down due to a fault, so as to form a reverse connection brake loop and dynamically brake the servo motor. The method is simple in process, high in automation degree, free of recycling limitation, free of loss, low in cost and very suitable for th