Abstract: A portable power take-off（PTO）shaft power test stand was introduced, suitable for various field test scenarios, such as production line online and offline inspections, agricultural machinery maintenance stations, and others．Test bench used an electric eddy current retarder as a measurement unit, coupled with a transfer case, to achieve loading functions, thereby satisfying PTO shaft power testing requirements for tractors under multiple working conditions．This test bench was characterized by its small size, light weight, strong adaptability, and stable and reliable loading．