The invention relates to an integrated method for thin oil blending, viscosity reduction, extraction and transportation of thickened oil, which is used for extracting, gathering and transporting the thickened oil of an oil field. By using the method, the viscosity of the thickened oil can be reduced, the flowing resistance can be reduced, and the output of the thickened oil can be improved. The method adopts the technical scheme that firstly, an organic solvent is blended into a pit shaft and automatically mixed with the thickened oil according to a mass ratio of 1.0 to 1.5 of the solvent to the thickened oil, so as to reduce the viscosity of the thickened oil; secondly, the thickened oil blended with the organic solvent is output to the outside of the pit shaft, is heated to a temperature of 50 DEG C to 150 DEG C through a heat exchanger and a heating furnace, and then enters a distillation tower fractionally distilled, and the organic solvent is output from the tower top, cooled to 0 DEG C to 30 DEG C through the heat exchanger, and transported back to the pit shaft for cycle use by using a pipe; and thirdly, the fractionally distilled thickened oil is output from the tower bottom and cooled through the heat exchanger, then thin oil is blended into the thickened oil to be mixed with the thickened oil according to a mass ratio of 0.3 to 0.4 of the thin oil to the thickened oil, and the oil is directly transported out after the viscosity is reduced. According to the method, the organic solvent blended into the pit shaft can be completely recycled for use; the method is suitable for ordinary thickened oil, special thickened oil and super thickened oil, and has high adaptability; and besides, by using the method, the use amount of the thin oil is greatly reduced, the utilization rate of the thin oil is increased, and the cost is reduced.