The invention discloses a tunnel connecting channel construction device comprising an excavating device in a tunnel segment, a shield device connected with the excavating device, a jacking device connected with the shield device, a hoisting device, supporting devices, a transferring device and a reaction frame, wherein the hoisting device, the supporting devices, the transferring device and the reaction frame are installed on a rack. The invention discloses a tunnel connecting channel. The device can be convenient to transport inward through a storage battery car and is automatically supported at the tunnel segment. Under matching of systems of the hoisting and transferring devices, the excavating device, the shield device and the like and on the basis of the integrated reaction frame, the segment is jacked through propelling oil cylinders, so that automatic forward excavating of equipment is achieved. On the basis of the construction device, the connecting channel can be constructed efficiently, safely, conveniently and rapidly, and the labor intensity of workers is relieved greatly.