The invention relates to the field of machinery, in particular to a transmission. The semi-stepless ladder-type transmission comprises a transmission, the transmission comprises a shell, wherein the shell arrange a power input shaft, a power output shaft, a transmission shaft and a fixed sliding rod, a driving wheel is arranged on the power input shaft, and a transmission wheel is arranged on thetransmission shaft. The transmission is simple in structure, the advantages of the manual cascaded transmission and the continuously variable transmission are combined, high-efficiency power transmission and strong torque bearing capacity of the manual transmission and the continuity and the smoothness of power during the lifting gear of the continuously variable transmission are possessed at thesame time, the operation of the lifting gear can be realized without interrupting power, the practical efficiency of the power is improved, the fuel is saved, and the device can be adapted to automobiles with any size.