The utility model discloses a speed reducer with rolling pin block output, comprising a ring block (5), a pin shaft (6), a rolling pin block, an input shaft, a planetary gear, an internal gear, an output shaft, a casing, etc. The two end faces of the ring block are parallel. The pin shaft is in interference fit in a hole of the ring block. The rolling pin block is composed of a rolling body (7) sheathed on the pin shaft (6). Compared with the traditional output mechanism of the K-H-V type planetary gear speed reducer, the utility model has simple structure and convenient process. By replacing the K-H-V type speed reducer of the slide block type output mechanism, the transmission power is increased from 2.2KW to over 10KW. The transmission efficiency is increased and the utility model can continuously run.