The invention provides a shear-fork type insulation overhead work platform car which is simple in structure, convenient to operate, and capable of improving operation reliability and safety. The shear-fork type insulation overhead work platform car comprises a car body which is provided with a car head and a carriage; a platform assembly is arranged in the carriage and connected with the carriage through a shear-fork mechanism; the platform assembly comprises a bracket, an enclosing platform and a push oil cylinder, wherein the bracket and the enclosing platform are both made of glass fiber reinforced plastics; a pair of guide rails are arranged on the two sides of the bracket; a pair of guide sleeves are arranged on the two sides of the bottom face of the enclosing platform; the guide sleeves are cooperatively arranged on the guide rails in a sleeving mode; the push oil cylinder is located between the enclosing platform and the bracket; a cylinder body of the push oil cylinder is arranged on the bracket; and a hydraulic rod of the push oil cylinder is connected with the enclosing platform, so that the enclosing platform is horizontally arranged on the bracket in a movable mode. The shear-fork type insulation overhead work platform car can act in an electrified mode during work, and is suitable for operation of overhead line structures on country roads of rural areas, thereby improving the working efficiency and lowering the labor intensity.