The invention relates to a single girder overhead crane, which comprises a girder frame, wherein each upper end of two sides of the girder frame is fixedly connected with an end girder guide rail separately, each end girder guide rail is provided with an end girder; the two ends of a main girder are fixedly connected with two end girders separately; the main girder is further provided with a hoist trolley; the end girders are rectangular; the bottom of each end of the main girder is fixedly connected with the top of each end girder; the cross section of the middle part of the main girder is I-shaped; the hoist trolley is U-shaped and mounted on the base of the main girder. By adopting the method in which the main girder is fixedly connected with the top of each end girder, the structure of the single girder overhead crane is more stable, the manufacturing technique is simple and the end girders lift the main girder, thus the lift height of goods is effectively increased and the space of a factory plant is sufficiently utilized.