The invention discloses a base-movable aeroengine dual-rotor system model experiment platform, which comprises a base rotary table seat, a transmission shaft A, a transmission shaft B, a base rotary table and an inner rotor and outer rotor subsystem, and the transmission shaft A and the transmission shaft B can synchronously rotate; the inner rotor and outer rotor subsystem mainly comprises an inner rotor, an outer rotor, an inner rotor low-pressure compressor rotary table, an inner rotor low-pressure turbine rotary table, an outer rotor high-pressure compressor rotary table, an outer rotor high-pressure turbine rotary table, three bearing blocks (A, B, C) and a rotor system base fixedly connected with the base rotary table; the inner rotor is inserted in an outer rotor and supported on the bearing blocks (A, B), the bearing block A is a damping-adjustable support, and the bearing block B is a flexible support; one end of the outer rotor is supported on the inner rotor by ball bearings, and the other end of the outer rotor is supported on the bearing block C, which is a flexible support; and infrared optical sensors and eddy current sensors are arranged on both the inner rotor and the outer rotor to test the vibration signal of the system. The base-movable aeroengine dual-rotor system model experiment platform can effectively simulate the dynamic experiment of a dual-rotor system of an aeroengine under actual working conditions.