The utility model relates to an attachment fastener is connected to prefabricated mid -board in tunnel, by prop boots, fixing support, fixed plate, prop the boots bolt, support bolt, horizontal fixingbolt constitute, prop boots and lie in the top that the fastener is connected to the prefabricated mid -board in a tunnel, be connected with the vault lining cutting through propping the boots bolt,fixing support lies in the below that the fastener is connected to the prefabricated mid -board in a tunnel, is connected through support bolt and bottom plate, and the fixed plate lies in the centreof the prefabricated mid -board connection fastener in a tunnel, and the horizontal bolt through the middle part is connected with the mid -board, through on the horizontal bolt on upper portion withprop boots and be connected, the horizontal bolt through the lower part is connected with the support. The beneficial effects of the utility model are that: this design has simple structure, simple tooperate's advantage, the device can play the effect of fixed prefabricated thin wall mid -board, makes between thin wall mid -board piece and the piece, between mid -board and bottom plate, mid -board and the bottom plate unified whole of formation, has guaranteed the connectivity between the mid -board.