A load simulation technology for ground test system of wind turbine drive chain was proposed. The ground drive chain test system of wind turbines were discussed, and the inertiamoment of impeller under the drag test was calculated. Three main non-torque five-degree-of-freedom loading structural schemes were summarized, i.e., symmetrical loading scheme, radial eccentric loading scheme and parallel six hydraulic cylinders loading scheme. The loading principles of the schemes were discussed, and the load solving equations of the three schemes were constructed. A 100 kW wind turbine drive chain test system loading experimental bench was designed and constructed based on the principle of symmetrical loading scheme in order to further simulate the six-degree-of-freedom load of the wind turbine. The load was accurately reproduced, the feasibility and the rationality of the non-torque five-degree-of-freedom loading technology was verified, and combined with the wind torque load simulation technology, a complete simulation of the wind turbine's six-degree-of-freedom load was achieved.