The utility model discloses a GIS basin-type insulator. The utility model belongs to power system safe operation facilities. The epoxy resin basin comprises an epoxy resin basin body and an aluminum alloy flange, wherein the aluminum alloy flange is arranged along the periphery of the edge of the epoxy resin basin body, and is characterized in that the height h of the epoxy resin basin body is 120mm, the diameter D of a basin opening is 440mm, a central circular hole with the radius of 45mm is formed in the basin bottom, the thickness b of the aluminum alloy flange is 20mm, and the width a ofthe aluminum alloy flange is 25mm; wherein the epoxy resin pot body outer wall flared arc is an equation, and the epoxy resin pot body inner wall flared arc is an equation; wherein x represents the radial distance from the arc of the basin-type insulator to the circle center, and y represents the axial distance from the arc of the tangent plane of the basin-type insulator to the circle center. According to the utility model, the risk that the basin-type insulator is damaged due to overhigh local stress is reduced, and the service life of the basin-type insulator is further prolonged.