Provided are a frost heaving force measuring device and method. The measuring device comprises a base, a connecting shaft, a connecting bolt, a guiding shaft, a transferring rod, a transferring rod protecting pipe, a sensor measuring head, a communication plate, a displacement plate and a limiting plate. The device and method are characterized in that when frost heaving soil generates frost heaving and melting effects and has displacement changing, the displacement plate of the frost heaving force measuring device is driven to have synchronous displacement changing, then the transferring rod is driven to have displacement changing, so that the sensor measuring head of the frost heaving force measuring device is under stress, and the magnitude of force can be measured when the frost heaving soil generates frost heaving and melting effects. The connecting shaft, the guiding shaft and the connecting bolt are added between the base and the transferring rod, the connecting bolt is connected with the connecting shaft and the guiding shaft, a hinge mode is used, the structure is simple, burying mounting is convenient, and the measuring method is quick. Machining is easy, and achieving is easy.