The invention provides an H-shaped power transmission bearing structure for a winch. The H-shaped power transmission bearing structure comprises a left end cover, a right end cover and a winding drumassembly, wherein the left end cover and the right end cover are arranged at the two ends of the winding drum assembly respectively. A main shaft assembly, a planet carrier assembly II and a planet carrier assembly I are sequentially arranged on one side of the winding drum assembly, a rolling bearing is arranged between the winding drum assembly and the main shaft assembly, and the left end cover, the right end cover and the main shaft assembly form a machine frame; the left end cover is fixed on the main shaft assembly through a screw I, the right end cover is fixed on the main shaft assembly through a screw II and a screw III, and a bearing retainer ring II is arranged on the right end cover. According to the H-shaped power transmission bearing structure, the heavy force can be borne while the power is effectively transmitted, and enough strength and rigidity are achieved. The lifting load capacity is large, the weight is about 1.2T, the effective diameter of the winch is small andis 78 mm, and the axial size is only 226 mm, so that the structure design is compact, the weight is effectively reduced, and large-load output and gravity support can be achieved under a small volume.