The invention discloses an extensible connection device for a bridge with an extensible structure falling water groove. The extensible connection device is arranged between adjacent
bridge deck slabs and comprises a pair of upper-portion guide plates, the lower-portion falling water groove, a connecting
rope and a connecting support, wherein the pair of upper-portion guide plates is symmetrically arranged between side walls of the adjacent
bridge deck slabs, the top ends of the upper-portion guide plates are fixedly arranged inside the adjacent
bridge deck slabs, and folding plates extending downward and obliquely are arranged at the bottom ends of the upper-portion guide plates. The connecting support is fixedly arranged on the side walls of the bridge
deck slabs and connected with one end of the connecting
rope, the other end of the connecting
rope is connected with the outside of the lower-portion falling water groove, a water collecting space with an upward opening is arranged inside the lower-portion falling water groove, and the
tail ends of the folding plates are arranged in the water collecting space. The extensible connection device is simple in structure, the upper-portion guide plates and the lower-portion falling water groove are of independent double structures, extension of the bridge
deck slabs does not cause
distortion of the connecting parts, and the service life of members is prolonged.