Differential mechanism with locking function, drive axle and vehicle

The invention relates to the technical field of vehicle transmission, in particular to a differential mechanism with a locking function, a drive axle and a vehicle, the differential mechanism comprises a differential mechanism shell, two half axle gears, a planet shaft, a planet gear, a sliding disc and a driving assembly, and the differential mechanism shell is provided with a containing cavity; at least one half axle gear is provided with a locking component; the sliding disc is arranged on the differential case in a penetrating mode so as to be provided with two parts located inside and outside the containing cavity respectively, and the sliding disc and the differential case rotate synchronously. A locking matching piece corresponding to the locking component is arranged at the position, in the containing cavity, of the sliding disc, the sliding disc is arranged at the end of the differential case in a sliding mode and provided with a locking position and a differential position which are located on a sli