The utility model discloses a shield constructs two spiral delivery mechanism of machine, including one -level spiral conveying mechanism and second grade spiral conveying mechanism, one -level spiral conveying mechanism is including the solid fixed cylinder body, flexible barrel, one -level screw rod to and one -level screw rod actuating mechanism, second -order helical conveying mechanism includes sealed cylinder, second grade screw rod and second grade screw rod actuating mechanism. When this shield constructs two spiral delivery mechanism of machine need retract at one -level spiral conveying mechanism's screw rod, second -order helical mechanism transfixion, the withdrawal of realization one -level spiral conveying mechanism screw rod that can convenient and fast, simultaneously flexible barrel still has the function of gate when the screw rod is retract, can save the gate one, has saved cost and installation space for screw conveyer's global design, the screw rod of second -order helical mechanism adopts 2 bearing structure, has avoided the direct contact of helical blade outer fringe with the barrel inner wall, can effectively prevent barrel inner wall and helical blade's wearing and tearing, has improved screw machine's life and job stabilization nature greatly.