The utility model discloses a single-girder portal crane for hoisting pipe sheets in a tunnel. The utility model belongs to the technical field of gantry cranes. The utility model mainly provides a single-girder portal crane for hoisting pipe sheets in a tunnel. The lifting appliance is mainly characterized by comprising a main beam, supporting legs, an electric hoist, a walking mechanism and a lifting appliance body; the main beam is an arched main beam; the arched main beam is a single main beam, and the two supporting legs are fixedly connected with the two ends of the arched main beam respectively. When a pipe sheet needs to be hoisted, the crane walks to the position of the pipe sheet conveying trolley, walks to the pipe sheet mounting equipment after hoisting the pipe sheet, and thenunloads the pipe sheet to the pipe sheet mounting equipment, so that hoisting of the pipe sheet is completed. The lifting appliance has the characteristics that the maximum lifting height is relatively high, the length of the duct piece is not limited by the span of a crane, the subsequent installation of the duct piece is facilitated, and the use is flexible, and is mainly used for lifting the prefabricated duct piece in a tunnel.