The invention relates to a dual break point moving contact structure for a dual power source automatic transfer switch. The moving contact structure comprises a first moving contact, a first load static contact, a load static contactor, a second load static contact, an insulation seat, a second moving contact, a first moving contactor, a first pin, an A power source static contact, an A power source static contactor, a third moving contact, a moving contactor spring, a fourth moving contact, a B power static contactor, a B power source static contact, a second pin, a second moving contactor and a rotating shaft; when the rotating shaft does not rotate and is at the zero position, A and B power sources are both disconnected; when the rotating shaft rotates in a clockwise or anticlockwise direction, the whole moving contactor assembly is driven to rotate in the clockwise or anticlockwise direction; after rotation to a certain angle, connection of the B power source and disconnection of the A power source or connection of the A power source and disconnection of the B power source can be realized. The moving contact structure has properties of strong connection/disconnection capability, excellent mechanical electrical performance, simple structure, low manufacturing cost, long service life, stable and reliable operation and small volume and saves space.