A free-falling body verification device for a drag-free spacecraft comprises a spacecraft simulation device (1), used for carrying out free-falling body motion on the ground; an inertial sensor or accelerometer (2), used for measuring the residual disturbance acceleration of the spacecraft simulation device (1); an attitude sensor (3), used for measuring attitude parameters of the spacecraft simulation device (1); a drag-free controller (4), used for processing the residual disturbance acceleration and the attitude parameters so as to obtain a feedback control signal; and a propeller (5), used for generating thrust action applied on the spacecraft simulation device (1) under the control of the feedback control signal, so as to enable the spacecraft simulation device (1) to overcome the residual disturbance of the external environment and maintain the attitude. The space operating environment is simulated by means of the free-falling body motion of the spacecraft on the ground within short time; the inertial sensor or accelerometer (2), the attitude sensor (3), the drag-free controller (4), and the propeller (5) are combined, so that the performance and function test verification for a space drag-free aerospace system is realized in the technical ground environment within short time.