The invention discloses a high-torque continuously variable transmission, which comprises a box body, an input shaft, an intermediate shaft I, a driving belt wheel I, a driven belt wheel I, a driving belt wheel II, an intermediate shaft II, a driven belt wheel II, an output shaft, a shifting fork, a shifting fork driving device, and a planet gear mechanism which is in transmission fit with the input shaft and the intermediate shaft II, wherein the driving belt wheel I is in transmission fit with the driven belt wheel I through a metal belt I; the driving belt wheel II is in transmission fit with the driven belt wheel II through a metal belt II; and the intermediate shaft II is in transmission fit with the planet gear mechanism. By the transmission, one part of power is directly transmitted to the planet gear mechanism through the input shaft, one part of power is input into the planet gear mechanism through the intermediate shaft, the transmission torque and transmission efficiency can be greatly improved due to differential transmission, and the power loss is reduced; moreover, the transmission combines metal belt variable speed with planet gear mechanism variable speed, a speed change ratio has a wider range, the variable speed performance is better, and the torque transmission capacity of the transmission can be improved due to a torque loading device.