The invention discloses an external physical controller for frequency conversion simulation of a self-adaptive power system real-time simulation platform. The external physical controller comprises computing units which are interconnected, a synchronous clock signal unit and an interface unit; the interface unit comprises a digital input interface unit, a digital output interface unit, an analog input interface unit and an analog output interface unit; the synchronous clock signal unit is provided with an interface which is used to connect with an external power system real-time simulation platform, clock signals which are used to accept synchronous clock signals output by the power system real-time simulation platform and provide various frequencies for the interface unit and signal computing units according to the received synchronous clock signals; the computing unit is used to generate control signals according to the received inputs and a preset control algorithm; the external physical controller for frequency conversion simulation of the self-adaptive power system real-time simulation platform solves the problem that in the power system real-time simulation platform, the existing controller cannot work correctly when the hybrid simulation is implemented.