The invention provides a hinge for locking a four-bar mechanism. The hinge comprises a locking hinge, an eccentric shaft, a limiting screw, a locking hook, a locking pin, a fork hinge, a cam, a hinge spindle, a deployment spring and the four-bar mechanism, wherein the locking hinge and the head of the fork hinge are hinged through the hinge spindle, the head of the locking hook is hinged in the middle of the hinge spindle, the limiting screw is fixed at the tail of the locking hinge along the locking hinge thickness direction, one end of a locking oscillating bar of the four-bar mechanism is hinged with the tail of the locking hinge through the eccentric shaft, the other end of the locking oscillating bar is hinged with one end of a connecting bar through the locking pin, one end of a crank is hinged with the other end of the connecting bar through a connecting bar spindle, the other end of the crank is hinged with the head of the locking hinge through a crank spindle, a crank pin is hinged on an extension arm of the crank, the cam is hinged at one end of the hinge spindle, an inner ring of the deployment spring is fixedly connected with the other end of the hinge spindle, and the outer end of the deployment spring is fixedly connected with the bar spindle. The hinge is applied to deployment and locking of components such as solar wings and high in locking rigidity.