The utility model discloses a shield constructs quick -witted marshalling train walking platform and shield constructs supporting trailer in machine back. This walking platform is provided with lap joint platform including fixing the platform truck platform that constructs each section platform truck bottom of the supporting trailer in machine back at the shield between the adjacent platform truck platform, walking platform upper berth is equipped with the platform track that is used for supplying marshalling train current, through setting up the walking platform, need not lay the track on the tunnel ground during the shield constructs the constrictive passageway of the supporting trailer in machine back, has reduced the construction degree of difficulty. The utility model provides a trailer of forming a complete set after the shield structure is quick -witted includes the walking platform, and " mouth " font passageway is changed into by traditional " door " font passageway to the trailer of forming a complete set after the shield structure is quick -witted, has strengthened the intensity of the structure of trailer of forming a complete set after the shield structure is quick -witted. Adopt the utility model discloses the shield constructs quick -witted marshalling train walking platform makes marshalling train construct owner's machine rear end by platform rail -engaging to the shield, has reduced and has laid orbital construction degree of difficulty, has improved the efficiency that marshalling train transported the material.