A chain support structure for a planar motor comprises: a fixing base, a support arm and a load-bearing member, the fixing base is fixed to the stator, the support arm has one end connected to the fixing base and has the other end connected to the load-bearing member, respectively, and the load-bearing member supports the chain from the gravity direction of the chain the chain, so as to prevent the chain from the gravity-caused sag of the chain, and prevent the abrasion or damage caused by the chain rubbing against the stator.