The invention provides an automobile overload warning system which relates to the technical field of intelligent safe-guard systems and comprises a micro-processing control unit, a tyre pressure monitoring unit, a tyre pressure comparison unit, a timing unit, a warning unit and an alarm unit, wherein the tyre pressure monitoring unit, the tyre pressure comparison unit, the timing unit, the waning unit and the alarm unit are connected to the micro-processing control unit. The automobile overload warning system has the advantages that overloading caused by a driver's wrong estimation of an automobile-carrying goods weight can be avoided; damage caused by the driver's deliberate overloading to public traffic safety can be prevented; and thus automobile overloading situations are prevented very comprehensively.