The present invention relates to the field of vehicle safety crash test dummies, and discloses an arm for a crash dummy, a control method, a device and a storage medium. The arm comprises: a first motor (1), a coupling (2), a capstan shaft (3), a first bevel gear (4), a second motor (5), a first capstan (6), a capstan bearing (7), an elbow joint base (8), a forearm (9), a first elbow joint bearing (11), drive lines (13), a second pulley (14), an elbow joint shaft (16), a first fixed sleeve (17), a second fixed sleeve (18), a second elbow joint bearing (20), an elbow joint connection block (22), a power source connection block (24), a second bevel gear (27), two sets of pulleys, a second capstan (28) and a power source bracket (29). The arm provided in this embodiment has an active function.