The invention relates to a testing device for simulating concrete test piece hydraulic fracture under a multi-field coupling condition. The testing device is characterized in that a large cylindrical pressure chamber is manufactured specifically, copper pipes are arranged on the inner wall of the pressure chamber, and the copper pipes are connected with an external refrigerating and heating system to control the temperature in the pressure chamber. A set of steel frame clamp manufactured specifically is fixed on a base plate of the pressure chamber, and a test piece is placed in the steel frame clamp. Water pressure is exerted on the test piece through a steel external member at the bottom of the test piece and a water permeable copper plate, and water is guided out from a steel external member on the upper portion of the test piece and the water permeable copper plate through a water pipe. Fracture water pressure and environment temperature simulation is added on the basis of a conventional three-shaft test. The device overcomes the defect that a traditional hydraulic fracture test can not simulate temperature environment change, can reflect a testing theory of the hydraulic fracture truly and is suitable for test research on concrete test piece hydraulic fracture under the water solid thermal coupling condition. The testing device has good market transformation prospects and is suitable for popularization.