The application discloses a kind of cable load type large-span bridge high-efficiency dismantling device, including two groups of
assembly support frame, several track trolley assemblies, two groups of
assembly support frame are oppositely distributed and are set across bridge, track is equipped on
assembly support frame, several track trolley assemblies are movably set on the track of two groups of assembly support frame, bridge is divided into several to be dismantled bridge blocks by
cutting, except the first and last two blocks of to-be-dismantled bridge blocks with bridge
pier in the bottom, the rest to-be-dismantled bridge blocks are connected with to-be-dismantled bridge block by cable and corresponding track trolley assembly of several track trolley assemblies, and several track trolley assemblies are sequentially lifted and transported to the
abutment close to by moving on track with the to-be-dismantled bridge block connected with it and broken down;
Assembly support frame includes first frame body, second frame body, the first frame body and the second frame body are respectively symmetrically distributed on the left and right sides of bridge, the first frame body and the second frame body one end bottom are respectively equipped with rotating device and
abutment connection, and the other end of the first frame body and the second frame body is connected by detachable mode.