Hinge mechanism capable of switching loading state and unloading state

The utility model belongs to the field of devices specially suitable for tests, and particularly relates to a hinge mechanism capable of switching a loading state and an unloading state. In order to solve the problem that a device capable of repeatedly applying a load with a specified size and canceling the load applied to a to-be-tested device does not exist in the prior art, the utility model provides a hinge mechanism capable of switching a loading state and an unloading state, which comprises a loading piece and a bearing piece which are hinged through a hinge shaft, the loading piece is fixedly connected with the hinge shaft, the bearing piece is connected with a force sensor, the loading piece is connected with a linear loading device, the bearing piece is provided with a through hole for the hinge shaft to penetrate through, and a gap is formed between the inner wall of the through hole and the outer wall of the hinge shaft, so that the bearing piece has a loading state in backstop fit with the hinge s