The invention relates to the technical field of material transportation of engineering construction, and particularly relates to a double-cableway slope transportation device and a using method thereof. The double-cableway slope transportation device comprises a winch and a supporting part which are positioned at a high position, and further comprises a cableway part, wherein the cableway part comprises a first main cableway and a second main cableway; a first hanging basket is arranged on the first main cableway; a second hanging basket is arranged on the second main cableway; the winch comprises a double-winding drum; a first auxiliary cable and a second auxiliary cable sleeve the double-winding drum; the first auxiliary cable is connected with the first hanging basket; and the second auxiliary cable is connected with the second hanging basket.