The present invention belongs to the machine technology field, it is to provide a chain type tensioner. By conventional tensioner uses a rope, such as a mesh belt, it was to solve the problem is not high stability of the tie-down for large cargo. The chain type tensioner is fitted gear and body hook one is connected, the lever is hinged to the body by a rotary shaft ratchet wheel is fixedly connected to the ratchet wheel while being movably connected to the body and the baffle plate, and fitted handle ratchet wheel is connected to the movably lever, middle is wound around the rotary shaft is in the body, the hook two are fixedly connected to one end together with out extending from the body at both ends a chain, composed of a rotary shaft, between the gear baffle plate and the body, is installed a spring capable of abutting the wheel pawl gear baffle plate, further positioning component is installed in the body, both ends of the spring each acting on the positioning parts and gear baffle plate. It tends to be processed along with the body and positioning parts by separating the configuration of the positioning parts and body.
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