An artificial muscle is characterized by mainly consisting of a driver, a threadlike body and a spiral track, wherein the maximal length of the threadlike body is larger than the total length of the spiral track; part of the threadlike body is limited by the spiral track to be spiral; the spiral track limits the motion of the threadlike body, so that the mass points on the spiral part of the threadlike body mainly slide along the spiral line of the spiral part; the threadlike body is flexible or elastic; and the driver drives the screw diameter of the spiral track to extend or retract. An extension tube is arranged outside the artificial muscle, and the two ends of the threadlike body are respectively connected with the two ends of the extension tube. The artificial muscle is further provided with a dimensional spring connected with the extension tube. The driver reasonably contains and applies the artificial muscle provided by the invention. The invention also provides a device with the artificial muscle. The artificial muscle has the benefits of being simple in structure and economical and practical.