The invention discloses a pressure sensor and belongs to the field of pressure inspection equipment. The pressure sensor comprises a plug-in type housing. Steam pipes are arranged at the front end of the housing. Pressure through holes are formed in the inside of the steam pipes; the outer parts of steam pipes are sleeved with sealed pipes; the top of each steam pipe is connected with a base board in a riveting mode; vent holes are formed in the base board; a pressure sensor chip is arranged on the base board; the pressure sensor chip is fixed with glue. A cover board is arranged on the cavity in an enclosing mode, the cover board is provided with a boss; the edge of the boss is provided with a flange ; the boss is sleeved with a dust cap; a pressure hole is formed in the middle part of the boss; the bottom of the pressure hole is closed through a filter membrane; the filter membrane is fixed through a convex ring; the pressure sensor chip and the base board are connected through bonding wires, the base board and a plug-in terminal are connected through bonding wires; the plug-in terminal passes through the housing and reaches out via a plug-in hole; the side face of the housing is provided with a lock catch component. The pressure sensor has the advantages of being reliable in structure, simple in manufacture, easy to assemble, low in cost and used for the pressure inspection of the traditional low pressure oil tank.