Provided is a structure of a porous spinal implant including a cage body inserted between adjacent vertebral bodies and divided by an upper surface, a lower surface, a left surface, a right surface, a front surface, and a rear surface, a plurality of vertical pores formed on the upper surface and the lower surface of the cage body, and a plurality of horizontal structures stacked on the left surface and the right surface of the cage body, wherein the plurality of vertical pores and the plurality of horizontal structures are each formed in a pattern that repeats in up-down, left-right, and front-rear directions. The structure of a porous spinal implant is capable of reducing strength of a cage body close to that of a vertebral body.