The invention discloses a high temperature heat pump and low temperature generating set performance test system which comprises a circulation loop formed by a heat source, a heat source circulating pump and a hot water tank, a circulation loop formed by the hot water tank, a heat source side water mixing pump and a first water-water mixer which is connected with an evaporator circulating pump of a set to be tested, a circulation loop formed by a cold source, a cold source circulating pump and a cold water tank, and a circulation loop formed by the cold water, a cold source side water mixing pump and a second water mixer which is connected with a circulating pump at the condenser side of the set to be tested. A third water mixer is connected with water mixing pumps which are connected with a condenser outlet of the set to be tested, and is respectively connected with the evaporator outlet of the set to be tested, an evaporator circulating pump of the set to be tested and the second water mixer. The high temperature heat pump and low temperature generating set performance test system can test the performance of a high temperature heat pump set and the performance of a low temperature generating set, and saves investment on a test system and area occupied by a test system.