The invention provides an automobile speed limitation and maintenance reminding method and a vehicular speed limitation and maintenance reminding system, and relates to the field of automobile safety. According to the reminding method, real-time driving speed value of an automobile is detected, a preset driving speed value inputted by a user is acquired, the real-time driving speed value and the preset driving speed value are compared, different real-time driving speed values adopt different alarm modes to remind users to pay attention to decelerate and slowly drive, unsafe accidents caused by divided attention due to viewing an instrument panel in the driving process are avoided, accumulated mileage is acquired based on accumulated real-time driving speed value, the accumulated mileage and preset mileage are compared, the user is reminded when the automobile needs to be maintained, the preset driving speed value is inputted, road information cannot be acquired by GPS (global position system) signals, and the reminding method solves the problem that navigation software is opened, so that over-speed is reminded, and GPS signals are unstable. After the automobile stops, a system enters dormancy, a power supply of an input unit is turned off, the input unit cannot receive preset driving speed values inputted by users, and energy consumption is reduced.