The invention belongs to the technical field of heat exchanger tests, and provides a comprehensive heat power engineering system used for a heat exchanger test. The comprehensive heat power engineering system used for the heat exchanger test comprises a heat source circulation system, a cold source circulation system and a tested heat exchanger (6); steam for entering the heat source circulation system is divided into three branches of steam, the first branch of steam of a steam inlet (1) is directly communicated with the tested heat exchanger (6), the other two branches of steam of the steam inlet (1) is communicated with the tested heat exchanger (6) through a heat exchanger I (3) and a heat exchanger III (11) respectively, the heat exchanger I (3) is communicated with an expansion oil tank (4), and the heat exchanger III (11) is communicated with an expansion water tank (10); the cold source circulation system comprises a cooling tower (7) and a water storage tank (8). Through the comprehensive heat power engineering system used for the heat exchanger test, the testing experiment is achieved within a wide range, the testing accuracy and the testing efficiency of the heat exchanger test are improved, the cost of a heat exchanger test platform is reduced, and tests of different products can be fast switched.