The invention discloses a motor vehicle fuel heating device. The device comprises an inner core. The inner core in a circular tube shape is wound by a heating wire and then is fixedly installed on a cylindrical shell to form a sealed pot. The device further comprises an O-shaped sealing ring which makes contact with or is connected with an annular sealing head to be used for isolating an inner core tube cavity from the heating wire space. The motor vehicle fuel heating device has the good sealing performance, and has the extremely high pressure bearing capability which can reach 30 Mpa through tests. A fuel channel and an electric device installation space are independent from each other, electricity is isolated from gas and liquid, only heat is transferred, no electricity is leaked, and no potential safety hazard is produced. The motor vehicle fuel heating device is suitable for heating motor vehicle fuel, and suitable for heating motor vehicle gas fuel (such as natural gas and methyl alcohol).