The utility model discloses a subway construction is with portable power source formula track laying machine, including door -like scaffold, install on door -like scaffold hoisting apparatus with be used for driving the running gear of door -like scaffold back -and -forth movement, still including installing the portable power source on door -like scaffold or running gear, door -like scaffold includes girder and two height -adjustable formula landing legs of installing respectively in girder both sides below, the girder comprises at the flexible roof beam that both ends were controlled to straight roof beam straight roof beam and grafting, flexible roof beam has the end of pegging graft and stiff end, the inside at straight roof beam is installed to the grafting end of flexible roof beam,the stiff end fixed mounting of flexible roof beam is at the top of height -adjustable formula landing leg. The utility model discloses a portable power source is as originally laying orbital power supply, and when laying a railway track in the interval of growing up, the portable power source that only needs to be changed need not many times more replaceable power interface, does not need frequently to receive and release and coils the cable conductor, has practiced thrift and has laid required manual work, machines, material and the time cost of construction power.