A high speed current and voltage synchronous acquisition device is developed based on single-chip computer. Without the use of speed and torque sensor, a motor speed identification algorithm based on frequency spectrum analysis and a motor torque identification algorithm based on air gap torque method are proposed. The portable motor energy efficiency test equipment is developed, which can complete the motor energy efficiency test without dismantling the motor on site. This tester can realize convenient and fast test. It is used to test a motor and the test results are compared with those obtained from an integrated motor performance testing system. The good agreement between the results verifies the applicability of the portable tester. It can meet the practical engineering test requirements.