The utility model provides a drive shaft assembly special for an electric truck. The drive shaft assembly solves the problems that a traditional drive shaft can not be directly matched with a motor output flange and the like. The drive shaft assembly comprises joint forks, universal joint pins, clamp springs, flange yokes, a shaft pipe and a flange disc. The joint forks are connected with the flange yokes through the universal joint pins and the clamp springs, the ends of the shaft pipe are welded with the outer circles of the joint forks, and after dynamic balance, the flange disc and the flange yokes are integrally connected through bolts and nuts. The drive shaft assembly is simple in structure, reasonable in design, low in cost and convenient to assemble and disassemble, the risk of electric leakage is avoided, the flange disc and the flange yokes are redesigned to be matched, the structure is more reasonable and scientific, and transmission efficiency is higher; a traditional drive shaft needs to be made to a telescopic drive shaft under the condition that intermediate support does not exist, cost is high, and according to the drive shaft assembly, the middle telescopic part is directly changed to shaft pipe connection, and cost is saved.