The utility model provides a tyre pressure monitoring device and car belongs to car technical field. Wherein, the tyre pressure monitoring device includes: the setting is at the inside pressure sensor of every tire of car for the monitoring belongs to the atmospheric pressure of tire and gives central processing module with the atmospheric pressure data transmission who acquires, central processing module is used for confirming the position of the tire that every pressure sensor locates, establishs the corresponding relation between atmospheric pressure data and the tire position, and will the corresponding relation sends for the display, the display is used for showing the corresponding relation. The technical scheme of the utility model need not define the tire position that each sensor corresponds, guarantee the exactness of monitoring data in the time of can changing in the tire position of car.