The invention relates to a hydraulic roll stabilization system of a two-track vehicle, comprising a divided roll stabilizer on at least one axle, the stabilizer halves of which can be twisted in relation to each other by means of a hydraulic oscillating motor, in that, by means of hydraulic lines having a plurality of valves that can be controlled by an electronic control unit, a hydraulic medium conveyed by a pump is introduced in a specific manner into two working chambers of the oscillating motor that act against each other. The pump is driven by electric motor and thus can be controlled in respect of the delivery rate of the pump, and, in each hydraulic line leading to one of the two working chambers of the oscillating motor, a switching valve associated with said working chamber is provided, which switching valves are opened or closed in a specific manner by the electronic control unit in accordance with the driving state of the vehicle and the value of the hydraulic pressure difference between the two working chambers.