The invention provides an ozone oil preparation device. The ozone oil preparation device comprises an electrolysed water ozone preparation unit, a balanced water tank and a mixing oil tank. An ozone outlet of the electrolysed water ozone preparation unit is connected to the mixing oil tank, and ozone is mixed with vegetable oil in the mixing oil tank. A hydrogen outlet of the electrolysed water ozone preparation unit is connected to the balanced water tank. The electrolysed water ozone preparation unit comprises an electrolytic tank, a cathode water tank and an anode water tank. The electrolytic tank is composed of a cathode cavity and an anode cavity which are attached together. The bottom of the cathode water tank is provided with a cathode water connector, the top of the cathode water tank is provided with a hydrogen outlet and an inlet water switch, and the position, close to the bottom, of the side face is provided with a cathode air inlet. The bottom of the anode water tank is provided with an anode water connector, the top of the anode water tank is provided with an ozone outlet, and the position, close to the bottom, of the side face is provided with an anode air inlet. Thecathode cavity is connected with the cathode water connector and the cathode air inlet of the cathode water tank. The anode cavity is connected with the anode water connector and the anode air inletof the anode water tank. The cathode water connector of the cathode water tank is connected with the anode water connector of the anode water tank.