Rear drive axle of plant protection vehicle

The utility model relates to a rear drive axle of a plant protection vehicle, and belongs to the technical field of drive axles. Comprising a differential speed reducer assembly, telescopic half shafts, telescopic half shaft axle housing assemblies and a gate type axle housing, the telescopic half shafts and the telescopic half shaft axle housing assemblies can stretch or retract in the axial direction, and the two telescopic half shafts are in transmission connection to the two sides of the differential speed reducer assembly respectively; the telescopic half shafts of the two sets of telescopic half shaft axle housing assemblies are sleeved with the two sets of telescopic half shaft axle housing assemblies respectively, and the two gate-type axle housings are longitudinally arranged at the tail ends of the telescopic half shaft axle housing assemblies on the sides of the two gate-type axle housings respectively. According to the rear drive axle, the span between the wheels on the two sides can be adjusted a