The invention discloses an 
electric drive and 
hybrid power transmission device based on a composite planetary 
gear train. The 
hybrid power 
system comprises the composite planetary 
gear train with twogear rings, a simple planetary 
gear train transmission mechanism, a generator, a driving motor, a plurality of clutches, direction-selectable clutches, a controller, a motor 
inverter, an external 
battery pack and external power such as an engine. A small gear ring of the composite gear 
train is connected with the motor through a fixed speed ratio, and a large gear ring is connected with the outputshaft through a fixed speed ratio. The composite 
planet carrier is connected with a gear ring of the simple gear 
train. An external power input shaft can be connected with a simple 
planet carrier, acomposite gear 
train sun gear and a motor connecting gear through a 
clutch. The device can provide a 
hybrid power working mode with three 
electric drive speed ratio gears, one series connection, threecontinuous speed changes and nine fixed speed ratios. The 
electric drive and 
hybrid power transmission device is suitable for electric drive and 
hybrid power coupling transmission of electric and 
hybrid power vehicles, including ships and amphibious vehicles, aircrafts, and 
engineering machinery.