A tire pressure monitoring system, comprising: a plurality of tire pressure sensing modules, installed on tires of a vehicle respectively, each of the tire pressure sensing modules having a device identification code and comprising: a detection unit, configured to constantly detect a tire condition of the tire and to output a set of tire condition information; and a first data transmission unit, in information connection with the detection unit to transmit the tire condition information and the device identification code; and an information display module, in information connection with the plurality of tire pressure sensing modules, comprising: a second data transmission module, connected to the first data transmission units to receive the device identification codes and the tire condition information of the plurality of tire pressure sensing modules; a data processing unit, configured to obtain the device identification codes and the tire condition information from the second data transmission unit, and to associate each of the device identification codes with a device selection code; a display unit, in information connection with the data processing unit, configured to display the tire condition information obtained from the data processing unit; characterized in that the information display module further comprises a stepless knob, in information connection with the data processing unit, configured to output at least one selection signal to the data processing unit by a control means; and wherein the selection signal is associated with the device selection code; the corresponding tire condition information is read according to the corresponding device selection code when the data processing unit receives the selection signal, and is outputted to the display unit for display. a plurality of tire pressure sensing modules, installed on tires of a vehicle respectively, each of the tire pressure sensing modules having a device identification code and comprising: a detection unit, configured to constantly detect a tire condition of the tire and to output a set of tire condition information; and a first data transmission unit, in information connection with the detection unit to transmit the tire condition information and the device identification code; and a detection unit, configured to constantly detect a tire condition of the tire and to output a set of tire condition information; and a first data transmission unit, in information connection with the detection unit to transmit the tire condition information and the device identification code; and an information display module, in information connection with the plurality of tire pressure sensing modules, comprising: a second data transmission module, connected to the first data transmission units to receive the device identification codes and the tire condition information of the plurality of tire pressure sensing modules; a data processing unit, configured to obtain the device identification codes and the tire condition information from the second data transmission unit, and to associate each of the device identification codes with a device selection code; a display unit, in information connection with the data processing unit, configured to display the tire condition information obtained from the data processing unit; characterized in that the information display module further comprises a stepless knob, in information connection with the data processing unit, configured to output at least one selection signal to the data processing unit by a control means; and wherein the selection signal is associated with the device selection code; the corresponding tire condition information is read according to the corresponding device selection code when the data processing unit receives the selection signal, and is outputted to the display unit for display. a second data transmission module, connected to the first data transmission units to receive the device identification codes and the tire condition information of the plurality of tire pressure sensing modules; a data processing unit, configured to obtain the device identification codes and the tire condition information from the second data transmission unit, and to associate each of the device identification codes with a device selection code; a display unit, in information connection with the data processing unit, configured to display the tire condition information obtained from the data processing unit; characterized in that the information display module further comprises a stepless knob, in information connection with the data processing unit, configured to output at least one selection signal to the data processing unit by a control means; and wherein the selection signal is associated with the device selection code; the corresponding tire condition information is read according to the corresponding device selection code when the data processing unit receives the selection signal, and is outputted to the display unit for display. wherein the selection signal is associated with the device selection code; the corresponding tire condition information is read according to the corresponding device selection code when the data processing unit receives the selection signal, and is outputted to the display unit for display.