Double-planetary-gear-train multi-power coupling mechanism

The utility model discloses a double-planetary-gear-train multi-power coupling mechanism, which is characterized in that the multi-power coupling mechanism is provided with a first planetary gear train and a second planetary gear train, wherein the first planetary gear train consists of a first sun gear, a first planetary gear, a first planetary carrier and a first gear ring, the second planetary gear train consists of a second sun gear, a second planetary gear, a second planetary carrier and a second gear ring, an output rotating shaft of an internal-combustion engine is connected with the first planetary carrier, a rotating shaft of a first motor/generator is connected with a center shaft of the first sun gear, the first gear ring is connected with the second planetary carrier, a rotating shaft of a second motor/generator is connected with a center shaft of the second sun gear, the second gear ring is connected with an external transmission system through a gear center shaft of a power output gear, and the center shaft of the second sun gear, the center shaft of the first sun gear, the second planetary carrier and the first planetary carrier are respectively provided with lockers. The double-planetary-gear-train multi-power coupling mechanism is low in control difficulty, can realize multiple work modes, is totally a continuously variable transmission utilizing hybrid power, and keeps the internal-combustion engine working in the best fuel economizing area.