The invention provides a gauge-variable wheel set and a gauge-variable bogie. The gauge-variable wheel set and a gauge-variable bogie comprise an axle, wheels, transmission mechanisms and a driving device, wherein the wheels are respectively arranged at both ends of the axle, the transmission mechanisms are respectively arranged at the inner sides of the wheels and are in accordant connection withthe corresponding wheels; the transmission mechanism comprises an inner sleeve, a middle transition sleeve and an outer sleeve arranged from inside to outside; the connecting end of the inner sleeveis connected with the inner side of the wheels; the outer periphery of the inner sleeve is provided with an external spline; the inner periphery of the middle transition sleeve is provided with an internal spline; the inner sleeve are in accordant connection with the middle transition through sleeve the outer spline and the inner spline; the driving device comprises a driving gear and a driven gear, the periphery of the outer sleeve is fixedly sleeved with the driven gear, the driving gear is meshed with the driven gear, and the driving gear drives the driven gear to drive the wheels to rotate; a locking sleeve is arranged between the wheels and the axle, the locking sleeve is provided with a locking table, and a plurality of locking grooves which are used for locking the locking table arearranged in an axle box body at intervals along the axial direction of the axle box body. The gauge-variable wheel set and a gauge-variable bogie can improve the dynamic performance of a gauge-variable train.