The invention discloses a pure electric double-axle power coupling four-wheel drive system. The pure electric double-axle power coupling four-wheel drive system comprises a front axle drive assembly,a rear axle drive assembly and a central transmission shaft; and the two ends of the central transmission shaft are correspondingly connected with the front axle drive assembly and the rear axle driveassembly so as to realize power transmission between the front axle drive assembly and the rear axle drive assembly. The pure electric double-axle power coupling four-wheel drive system can be used for various four-wheel drive new energy vehicles driven by using pure electric motors, such as limousines, cross country vehicles and engineering vehicles. The pure electric double-axle power couplingfour-wheel drive system can be suitable for carrying driving motors with same or different powers on front and rear axles so as to realize power output under different working conditions. According tothe pure electric double-axle power coupling four-wheel drive system, by using a special integrated design of a planet gear, a power coupling transfer case and a main speed reducer, 10 driving modessuch as single-motor drive or double-motor coupling drive can adapt to different vehicle running conditions, and therefore, the motor driving efficiency is enhanced, the vehicle power performance andeconomic performance are improved, and the driving ability of the vehicle on a special pavement is guaranteed.