The invention belongs to the technical field of chain-type cooling bed tools and particularly relates to an automatic lubricating system of an open chain-type cooling bed. The open chain-type cooling bed comprises a chain-type cooling bed body, a push chain wheel, a push chain, a band chain wheel and a band chain, wherein a plurality of oil pipes are arranged on the chain-type cooling bed body; an oil storage tank is higher than the oil pipes; the automatic lubricating system is controlled to be started when the chain-type cooling bed starts to run and is controlled to be stopped when the chain-type cooling bed stops running. The automatic lubricating system has the benefits as follows: automatic short-cycle circulating lubrication replaces long-cycle manual lubrication, and required parts can be lubricated quantitatively and periodically in time.