Retrofitting type wheel tread adjusting device

The utility model discloses a retrofit type wheel tread adjusting device which comprises a transmission wheel shaft set connected with a plurality of tire connecting pieces and further comprises a wheel tread adjusting cushion block, a plurality of transmission grooves are formed in the wheel tread adjusting cushion block, each tire connecting piece is detachably connected with a lengthened shaft piece, and the lengthened shaft piece is connected with a wheel tread adjusting cushion block. And one side of the wheel tread adjusting cushion block is connected with the transmission wheel shaft set in an abutting mode, and the other side of the wheel tread adjusting cushion block is connected with a tire in an abutting mode. According to the additionally-mounted wheel tread adjusting device, the wheel tread can be further widened according to self requirements, so that the stability in the field driving process is improved, meanwhile, the rollover angle generated when the vehicle runs on a slope in the field is r