A suspension swing device includes a supporting beam (3) of a supporting bracket (1), a suspended joint (4) fixed on the supporting beam (3) via bearings, a suspended swing stems (41), a gear motor (5), a torque output plate (55), a swing pushing member (54), a swing direction monitor (6) and a microcomputer controller (7). The suspended swing stem (41) is mechanically connected with the suspended joint (4). The gear motor (5) is mechanically connected with the supporting beam (3). The torque output plate (55) and the swing pushing member (54) are connected to the output shaft of the gear motor (5). The microcomputer controller (7) is connected with the swing direction monitor (6) and the gear motor (5). The on-off operation of the gear motor (5) is controlled by the microcomputer controller (7).