The present application discloses monitoring system, which includes a mounting base and a monitoring device. The mounting base includes a base, a first cover, a second cover and a fastening member. The base includes a ball shaft and a first wire accommodating portion located in the ball shaft. The first cover and the second cover are sleeved on the outside of the ball shaft. The second cover includes a second wire accommodating portion, an outer screw thread and a connecting portion, and the outer screw thread is adjacent to the connecting portion. One end of the fastening member is connected to the first cover, and the fastening member is screwed to the second cover. The monitoring device includes a housing connected to the connecting portion of the second cover, and a wire accommodated in the first wire accommodating portion and the second wire accommodating portion.