A tire pressure sensor installed on a tire rim, the tire rim comprising an assembly through hole; the tire pressure sensor comprising: a sensor body, comprising: a first housing including an accommodating chamber; a second housing engaging with the first housing to enclose the accommodating chamber; a gas nozzle assembly hole;a tire pressure sensing module disposed in the accommodation chamber for detecting a tire pressure, including a control unit which saves a firmware for controlling operation of the tire pressure sensing module; and an update connection port which includes at least one perforation disposed on the second housing and at least one conducting pin corresponding to the perforation and electrically connecting to the tire pressure sensing module, wherein the control unit receives an update firmware data through the update connection port for updating the firmware; a gas intake nozzle, comprising: a coupling section inserted into the gas nozzle assembly hole; and a gas intake section connecting to the coupling section, penetrating through the assembly through hole, and extending towards a direction outside the tire rim for gas to input; and a gas nozzle assembly member, penetrating through the gas nozzle assembly hole to couple with the gas intake nozzle; characterized in that the conducting pin includes one end fixed on the first housing and another end penetrated through the tire pressure sensing module and extended into the perforation. a sensor body, comprising: a first housing including an accommodating chamber; a second housing engaging with the first housing to enclose the accommodating chamber; a gas nozzle assembly hole;a tire pressure sensing module disposed in the accommodation chamber for detecting a tire pressure, including a control unit which saves a firmware for controlling operation of the tire pressure sensing module; and an update connection port which includes at least one perforation disposed on the second housing and at least one conducting pin corresponding to the perforation and electrically connecting to the tire pressure sensing module, wherein the control unit receives an update firmware data through the update connection port for updating the firmware; a first housing including an accommodating chamber; a second housing engaging with the first housing to enclose the accommodating chamber; a gas nozzle assembly hole;a tire pressure sensing module disposed in the accommodation chamber for detecting a tire pressure, including a control unit which saves a firmware for controlling operation of the tire pressure sensing module; and an update connection port which includes at least one perforation disposed on the second housing and at least one conducting pin corresponding to the perforation and electrically connecting to the tire pressure sensing module, wherein the control unit receives an update firmware data through the update connection port for updating the firmware; a gas intake nozzle, comprising: a coupling section inserted into the gas nozzle assembly hole; and a gas intake section connecting to the coupling section, penetrating through the assembly through hole, and extending towards a direction outside the tire rim for gas to input; and a coupling section inserted into the gas nozzle assembly hole; and a gas intake section connecting to the coupling section, penetrating through the assembly through hole, and extending towards a direction outside the tire rim for gas to input; and a gas nozzle assembly member, penetrating through the gas nozzle assembly hole to couple with the gas intake nozzle;