Tunnel top water diversion device

The invention relates to the technical field of tunnel construction, and discloses a tunnel top water diversion device which comprises a plurality of threaded longitudinal height adjusting structures, a plurality of threaded mounting structures, a plurality of spiral spring type universal pre-tightening structures and a plurality of air bag type buffering structures. According to the tunnel top water diversion device, water flow seeping from the tunnel top can flow out along a characteristic position, so that on the premise that the clearance height of a tunnel is not affected, the construction environment is improved, and the adverse effect of underground water on construction safety is reduced; an elastic buffering type pre-tightening function can be generated on an expansion screw mounting part, so that the negative influence of vibration on the mounting part in the working process is reduced, the stability of the water diversion device on the mounting part is improved, and then the effective working durat