A Large-section, high drop high-voltage cable line high point jointless continuous laying method is provided. A cable tray is arranged on the side with small drop difference of ji shape, a multi-functional guide sliding frame and a first conveyor are arranged on the pay-off side of the cable tray, a tractor is arranged on the side with large drop difference of ji shape, and low-friction pulleys and a plurality of conveyors are arranged on the cable culvert trench, the digging-free tubing, the narrow well, the cable bridge, the caisson with high drop difference, and the tunnel; The laying direction of the cable is from culvert - tubing - working well - slope culvert - bridge - slope culvert - caisson - tunnel. As that cable culvert, The safe and economical laying of high-voltage cable lines without joints at high drop points is realized through the development and application of non-excavated tubes, narrow shafts, cable bridges, high drop caisson, ji shaped high drop model composed oftunnels, non-excavated tubes, high drop caisson traction engineering model calculation and low friction pulley to reduce traction force.