The disclosure provides an intelligent fuel prompt device and method, wherein the device comprises a fuel quantity sensor configured to obtain fuel consumption information of a vehicle; a GPS module configured to obtain position information of the vehicle; a central processing unit configured to obtain reachable range information of the vehicle according to the position information and fuel consumption information of the vehicle; and a prompt module configured to prompt with respect to the reachable range information of the vehicle. As such, a user can be fully aware of the distance that the vehicle can travel with the remaining fuel quantity, and effective prompt of the fuel quantity is realized