Tire pressure monitoring system and tire pressure sensor thereof

Provided is a tire pressure sensor (TPS) of a tire pressure monitoring system (TPMS). The TPS includes a detachable and angle-adjustable tire valve coupled to the front side of a tire pressure sensor housing. A holder bracket having a tire valve insertion hole is at the front side, and an insertion head inserted into the valve insertion hole is at an end of the tire valve. Accordingly, the angle of the tire valve is freely controlled, allowing compatible use regardless of the shape or size of wheels of cars and commercial vehicles. Thus, manufacturing costs can be greatly reduced, thereby obtaining superior competitiveness over competitors' products. Furthermore, air leakage through a wheel valve hole can be effectively prevented against high speed rotation and inertia motion caused by the high speed rotation during the driving of a vehicle.