To study the mechanical behavior of fractured sandstone after freeze-thaw cycles under displacement constraints, a customized constraint device was used to apply displacement constraints to the sandstone specimens. Through the freeze-thaw cycle tests and uniaxial compression tests, the variation law of resistivity during the freeze-thaw cycles was investigated, and based on the results of uniaxial compression tests, the effects of fracture inclination, the number of freeze-thaw cycles and displacement constraints on the mechanical properties of the rock mass were analyzed. Real-time monitoring of the fracture propagation process during compression reveals the fracture propagation law and failure modes of the specimens. The results show that during the freeze-thaw cycles, the resistivity changes periodically: it increases when cooling down and decreases when warming up Under the displacement constraints, the peak displacement of the specimen increases first and then decreases with the increase of the fracture inclination angle. When loading from both directions, the peak displacement decreases first and then increases with the increase of the number of freeze-thaw cycles. The uniaxial compressive strength and elastic modulus of the fractured sandstone decrease first and then increase with the increase of the inclination angle, and reach the minimum at 45°. Displacement constraints inhibit fracture freeze-thaw damage when the number of freeze-thaw cycles is less than 30 times. and exacerbate the specimen damage when it is greater than 30 times. The larger the fracture inclination angle is, the faster the crack extension speed is, and the more the crack tends to propagate horizontally. According to the crack fracture morphology of specimens, the failure modes can be divided into X-type and Y-type.