The invention relates to a land leveller front-wheel drive, and provides a hydraulic system of the land leveller front-wheel drive in order to overcome the defects of an existing land leveller front-wheel drive. The hydraulic system comprises two variable pump groups, two front-wheel hydraulic motors, two front-wheel drive control valves, an oil supplementing pump, an oil tank, a two-position three-way speed switching valve and a counterbalance valve; each front-wheel drive control valve comprises a three-position four-way reversing valve and a two-position five-way reversing valve, two working oil ports of each variable pump group are correspondingly connected with one front-wheel drive control valve, and an A oil port and a B oil port of each front-wheel drive control valve are correspondingly connected with an A oil port and an R oil port of the corresponding front-wheel hydraulic motor.