The utility model discloses a variable connecting device of crane runway, include: the trapped orbit, through the track leg joint in on the apron, the removal can be dismantled to the apron, rotational rail, through the track leg joint on the floor, the floor is fixed not portable, and the pincers mouth, inlay card in trapped orbit and rotational rail's junction, rotational rail can dismantle fixed connection on the trapped orbit. For prior art, the utility model discloses variable connecting device of crane runway is satisfying safe, reliable and stable fixed the requirement under the prerequisite, has avoided orbital disassembling operation of relapse, and simple structure, the swift just convenient to use of installation have greatly improved work efficiency.