The present invention relates to a device for accelerating the combustion of liquid fuel for improving the combustion efficiency of liquid fuel used in an internal combustion engine and a system for accelerating the combustion of liquid fuel using the device. The device is characterized in that magnets are provided in a metal pipe, and pure tourmaline ceramics and mixed tourmaline ceramics are used as a catalyst, so that fuel molecules are atomized by the magnetic field, generated by the magnets, and by far infrared rays, radioactive rays, and the like generated from the catalyst, thereby accelerating the combustion of fuel. The internal combustion engine using the device and system of the present invention can realize fuel savings and can reduce the discharge of environmental pollutants.