Chain transmitting device of elevator

The utility model discloses an elevator chain type transmission device, which comprises an elevator active chain wheel, an elevation chain and an elevator servo chain wheel. Contact surface between the servo chain wheel and the elevation chain is a smooth round surface, and an elevation chain limit device is set on the servo chain wheel; two sets of chain wheels on servo shaft are saved, the chain moves freely on no-rail support wheel of the servo shaft, irregular error that may be caused during operation of the chain is removed so as to make the chain not be limited by with-rail wheel rim, to solve various defects in current technology such as rail missing of the chain, serious wearing, different installation and operation and high manufacture cost, to solve rail missing caused by excessive error of parallel degree of upper and lower chain wheels completely, to make wearing of the chain decrease 20%-30% and to reduce manufacture cost by 60%.