The invention relates to a spatial inertial sensor ground test device which comprises proof mass, a capacitive displacement transducer, a controller, a static execution mechanism and a suspension mechanism; and a suspension point between the suspension mechanism and the proof mass is positioned at the centroid of the proof mass. The test device realizes test on the performance of a static suspension accelerometer on three rotational freedom, can simulate the space environment more truly on the ground, and provides more comprehensive test on the performance of the static suspension accelerometer.