The invention discloses a differential output barrel which comprises a barrel component and a differential gear system; and the differential gear system is a bevel gear planetary differential gear system, and the rocker of the differential gear system is a clockwork box body in the barrel component. The differential output barrel has the benefits that because the bevel gear planetary differential gear system with higher transmission efficiency but larger axial size and an original motive component clockwork box of a mechanical watch are designed into a whole, the bevel gear differential gear system does not singly occupy the internal space of the watch, and the structure is very compact. The bevel gear planetary differential gear system has higher transmission efficiency so as to insure the planetary gear system can output stable moment when a double balance spring escapement system is synchronous (impulse and fall are released nearly simultaneously) and step by step, i.e. whether the differential mechanism of the gear system intervenes or not. The running stability and accuracy of the watch are ensured. In addition, two power output gear systems are in a symmetric structure relative to a power input gear system planetary gear in the planetary differential gear system, thereby reducing asymmetric power output error caused by a differential principle.