The invention discloses an engine power loading test system, and the system includes an instrument console, a basic drive assembly, a load control assembly, a heat dissipation assembly and an instrument sensing assembly, wherein the basic drive assembly, the load control assembly, the heat dissipation assembly and the instrument sensing assembly are disposed at an engine test site. The basic driveassembly includes a shaft coupler, a starter, an electronic throttle, a water tank and a fuel tank, wherein the shaft coupler, the starter, the electronic throttle, the water tank and the fuel tank are connected with a to-be-tested engine. The load control assembly includes a hydraulic load pump which is connected with the shaft coupler to apply a load, a hydraulic oil tank, a load line that is connected with the hydraulic load pump and the hydraulic oil tank, and a pressure control valve that is disposed on the load line. Through the above mode, the system provided by the invention cooperates with the instrument console capable of displaying the comprehensive test information on the basis of low energy consumption, achieves the high-efficiency engine loading test, remarkably reduces thearea occupied by equipment, simplifies the equipment structure, and reduces the test cost.