A tool suspension device includes a main body, a seat, and a receiving element. The main body has a suspension portion and a receiving groove. The receiving groove has a first positioning portion. The seat has a shape corresponding to a contour of the receiving groove to be received in the receiving groove. The seat further has a second positioning portion corresponding to the first positioning portion for engagement. The seat has a sliding track on a face opposite to the receiving groove wherein the sliding track is received in the receiving groove. The receiving element is slidably disposed on the sliding track and is able to leave the sliding track only via two opposite ends thereof. The receiving element is unable to leave the sliding track when the seat is received in the receiving groove. Thus, cost of molds is reduced.