Interbody fusion cage for lateral approach of lumbar vertebra

The interbody fusion cage comprises a fusion cage body, the fusion cage body comprises a top face, a bottom face, a left face, a right face, a front face and a back face, the front face of the fusion cage body is of a triangular structure formed by a first bone grafting window, a second bone grafting window and a third bone grafting window, and the top of the fusion cage body is an arc-shaped face. A pressure relief hole is formed in the base; inverted trapezoidal structures are symmetrically arranged on the left surface and the right surface of the fusion cage body, a positioning clamping groove and an imbedding hole are formed in the surface of each inverted trapezoidal structure, and a developing strip is arranged on the surface, connected with the front surface of the fusion cage body, of each inverted trapezoidal structure; a sawtooth structure is arranged on the front face of the fusion cage body, and the middle of the front face of the fusion cage body protrudes outwards. The front face and the back fa