The utility model relates to an adjusting cooling device for a power assembly stand and the adjusting cooling device comprises a water-tank pressure cover, a bypass pipe, a cooling-fluid circulation waterway, a heat exchanger, a liquid-level display pipe and an expansion water box. The adjusting cooling device also comprises a ball valve mounted on the bypass pipe. The adjusting cooling device has the advantages that a structure is simple and design is reasonable, manufacturing difficulty and cost are reduced, the adjusting cooling device can be used on stand test apparatuses, operation is stable and reliable and cost is low.