The utility model relates to the field of tunnel construction machinery, in particular to a steam curing trolley, which comprises a steam boiler, an extension rod, a rubber airbag, a trolley body, waterproof cloth, an annular support and an extension round pipe. The steam boiler is arranged at the bottom of the trolley body, the rubber airbag surrounds the radial end face of the trolley body, the waterproof cloth is coated on the periphery of the annular support, and the rubber airbag and the waterproof cloth are integrated into a cover. The annular support is composed of a fixed support and a movable support, wherein the fixed support is fixed on the trolley body, and two ends of the movable support are connected with the fixed support. The steam curing trolley realizes steam curing of concrete by the aid of a cover structure, and is simple in structure, fine in effect, low in cost and high in efficiency, and fills a domestic gap.