Energy-saving motor on-load test system

The invention provides an energy-saving motor on-load test system. The energy-saving motor on-load test system comprises a twin trawling motor platform, an accompanying frequency converter, an energyfeedback unit and a measurement and control platform, wherein the twin trawling motor platform comprises a tested motor M1 and an accompany motor M2, the tested motor M1 is coaxially connected with the accompany motor M2, and the accompanying frequency converter comprises a frequency converter body V1 connected with the tested motor M1 and a frequency converter body V2 connected with the accompanying motor M2. The speed of the tested motor M1 is controlled by the frequency converter V1, the accompanying motor M2 is driven by the frequency converter V1 and used for torque loading control, an output end of the frequency converter V2 is connected with the energy feedback unit, and the energy feedback unit feeds electrical energy sent by the accompanying motor M2 back to the tested motor M1 through an inverter; the me