A rectangular impact-resistant elastic connector includes an upper contact part, first and second side plates, first and second S-shaped lift force arms and a bottom plate, wherein the first and second side plates are connected with the bottom plate, the first S-shaped lift force arm has an end connected with the upper contact part and an end connected with one end of the first side plate, and the second S-shaped lift force arm has an end suspended below the upper contact part and an end connected with one end of the second side plate. The S-shaped lift force arm structures having the advantage of greater elasticity over other force arm structures under the same unit size are used to provide an elastic force, so that the size of the connector is reduced. The side plates protect the force arms, thus, improving the overall impact resistance of the connector.