The invention relates to a pressure switch based on the micro-electromechanical system (MEMS) technology. The pressure switch comprises a base and a pipe cap, wherein the pipe cap is provided with a pressure leading mouth; the base is provided with a groove, the other end of the base is provided with a cable hole; a cable is arranged in the cable hole; a switching component is arranged in the groove and provided with a sensitive component; the switching component contains a supporting body which is provided with a lower diversion hole and conducting cylinders; the sensitive component containsa clamping body and a silicon wafer; the silicon wafer is provided with a metal layer, elastic slots are formed on the lower part of the silicon wafer; a boss is formed between the elastic slots, an upper electrode is arranged on the boss; the clamping body is provided with a diversion hole; the surfaces of the both ends of the clamping body and the inner wall of the upper diversion hole form a lower electrode; the lower electrode and the metal layer are separately electrically connected with the corresponding conducting cylinders on the supporting body through internal leads; and the conducting cylinders are electrically connected with connecting leads respectively. The pressure switch of the invention has simple structure, good consistency and low cost and is easy to be integrated with the following circuit for signal conditioning, signal conversion and networking, thus the pressure switch has wide application range.