Pile bearing state testing device

The invention discloses a pile bearing state testing device which comprises a box body, a model pile used for being inserted into a model foundation is arranged in the box body, a sensor used for monitoring the stress state of the model pile is arranged at the bottom end of the model pile, and a loading device is arranged above the box body. The box body is provided with a supporting part used for supporting the loading device, the bottom of the loading device is provided with a connecting part matched with the top end of the model pile, and a universal joint is arranged between the loading device and the connecting part. According to the pile bearing state test device, the universal joint is arranged between the loading device and the connecting part, so that the loading device cannot slide laterally in the loading process, surface load loading of a model pile is realized, loading under the condition that the model pile is inclined can be ensured, and the test efficiency is improved. The pile bearing state e