The invention relates to a performance testing device of a static-pressure air bearing, which at least comprises a base (1), a film pressure sensor (2), a pressure regulating valve (3), an air intake tube (4), an air pressure gauge (5), a static-pressure air bearing (6) to be tested, a press plate (7), a bearing fixing component (8), a bearing connecting component (9), a linear driver connecting component (10), a limit bolt (11), a linear driver (12), a rack (13), a bracket (14), a force sensor (15), a displacement sensor (16), a driven gear (17), a driving gear (18), a driving motor (19) and a rotating encoder (20). The invention can test the bearing capacity and rigidity of the static-pressure air bearing under different air supply pressures and different air film thicknesses and the air pressure change in the bearing, thereby facilitating the performance testing of the static-pressure air bearing and the optimization of structural parameters of the bearing.