Lumbar interbody fusion cage

The invention provides a lumbar interbody fusion cage which comprises an upper movable part and a lower movable part which are connected in a hinged mode, through holes are formed in the upper movable part and the lower movable part respectively, bone block implanting holes are formed in the right ends of the upper movable part and/or the lower movable part, an outer blocking piece is arranged at the front end of the lower movable part, and the upper movable part and the lower movable part are connected in a hinged mode. The outer blocking piece extends to the right side of the through hole from the left side of the through hole, when the upper movable piece and the lower movable piece are in any state from closing to opening, the lower edge of the front end of the upper movable piece is always lower than the upper edge of the outer blocking piece, and the two through holes in the movable piece and the space between the upper movable piece and the lower movable piece jointly serve as the containing space of a