A system and a method for a hardware-in-the-loop (HIL) test of subsynchronous resonance of a double-fed fan, wherein the system comprises: a power electronic real-time simulation platform, which is built with a digital simulation model comprising a power grid, wind farm equipment, and a main circuit of the double-fed fan; said digital simulation model is downloaded after real-time implementation to a simulator of the power electronic real-time simulation platform; and a controller of the double-fed fan to be tested, which is connected to the digital simulation model by means of an input/output interface of the simulator. The present invention may flexibly and easily achieve an HIL test of subsynchronous resonance of the double-fed fan, and is closer to real engineering situations, so that test results are more accurate. Also provided is a method for an HIL test of a subsynchronous resonance suppression function of the double-fed fan, which may comprehensively evaluate the subsynchronous resonance suppression function of the double-fed fan.