The invention discloses a base oil pressurizing device. The base oil pressurizing device comprises an MTK-P300 air pressure sensor, a motor, a pressurizing tank and a screw rod; the motor is mounted in the middle of the upper end of the pressurizing tank, and a feed inlet is arranged on the right side of the upper end of the pressurizing tank; the MTK-P300 air pressure sensor is arranged in frontof the upper end of the pressurizing tank, the lower portion of the pressurizing tank is fixed to a support, and a squeezing tube is connected to the lower end of the pressurizing tank; a stirring shaft is vertically arranged in the pressurizing tank, a stirring paddle is horizontally mounted on the stirring shaft, and the screw rod arranged in the squeezing tube is connected to the lower side ofthe stirring shaft; the screw rod is in clearance fit with the squeezing tube; a booster pump and a vacuum pump are respectively arranged on the left side and the right side of a position, located onthe support, of the pressurizing tank. The base oil pressurizing device has the advantages that through the MTK-P300 air pressure sensor, the motor, the pressurizing tank and the screw rod, the problems that conventional base oil pressurizing devices have simple structures and circular pressurization and stirring cannot be realized are solved.