The invention provides a device for testing the damp-heat aging of a composite material, which overcomes the technical defects of single heat factor aged equipment. According to the device, multi-station, mechanical and stress loading accelerated damp-heat aging test can be realized, and theoretical references are provided for the application of the composite material. The test device comprises an aging box, a sample clamping system, a balance adjusting system and a stress-strain measuring system, wherein the sample clamping system comprises a steel framework, a bolt, a clamp, a sample station and a pin shaft 3; and the balance adjusting system comprises a balance beam, a pin shaft 8 and a counterweight. According to the device, 1-10 samples can be tested simultaneously, the service temperature of equipment ranges from the room temperature to 300 DEG C, the loading force of every sample is 0.5-8 tons, and continuous 5,000 hours of constant-temperature test or thermal cycle test can be realized; and by adopting the sample clamping system, samples can be prevented from slipping and loosening under the action of eight-ton tension. The device has a simple structure and higher test efficiency than the conventional equipment, and the test conditions are more consistent to the practical working condition.