The utility model relates to secondary lining construction equipment for the inner wall of a tunnel, in particular to a secondary lining integral trolley with a pipeline passing through a small-section tunnel of a mountain body, belonging to the technical field of processing of mechanical equipment. The secondary lining integral trolley has a telescopic bearing and supporting structure capable of walking and comprises an integral steel moulding plate; the upper part of the integral steel moulding plate is provided with a telescopic hinge; the integral steel moulding plate is fixed at a door frame by a plurality of lead screw adjusting rods; the lower part of the door frame is provided with a lower longitudinal beam for supporting; movable sliding shoes are fixed on the lower longitudinal beam; the door frame is provided with a cross beam which is provided with two support cylinders; and the support cylinders are provided with arc-mold supporting trusses. In the secondary lining integral trolley for small section, the structure is simple, the demoulding and moulding processes are fast, not only can the small-section lining be fast and safely carried out with guarantee of quality and quantity, but also the secondary lining integral trolley can be used for tunneling channels in tunnel excavation. Simultaneously, the quality requirement and the construction period progress of the tunnel lining construction concrete surface can be guaranteed.