A suspension device for a tool socket has a hanging panel (10), an end cap (20) and a fastening strip (30). The hanging panel (10) has a strip latch (12), and the end cap (20) has a through hole (22). The fastening strip (30) has an elongated body, a block (32) and a tongue (34). The tongue (34) of the fastening strip (30) is mounted through the through hole (22), a tool socket and the strip latch (12) to conveniently assembly the suspension device. Moreover, the fastening strip (30) allows the suspension device to be used with different sized tool sockets.