Tunnel under rail structure prefabricated block die and method for prefabricating tunnel under rail structure through tunnel under rail structure prefabricated block die

The invention discloses a tunnel under rail structure prefabricated block die and a method for prefabricating a tunnel under rail structure through the tunnel under rail structure prefabricated blockdie. A bottom die, side dies fixed to the two sides of the bottom die and end dies fixed to the two ends of the bottom die are included. An upper-flat and lower-curved type cavity structure is definedby the bottom die, the side dies and the end dies. The side dies and the end dies are connected with the bottom die through a plurality of guide rail assemblies, and after the side dies and the end dies are attached to the bottom die, fastening is conducted through bolts. The side dies on the two sides are provided with tenon movable templates and groove templates correspondingly, and the tenon movable templates are detachably connected with the side dies. The tenon movable templates are of a detachable structure, during form removal, the tenon movable templates are dismounted firstly, and the technical problem that i