Pressure sensor

The invention provides a pressure sensor, which comprises a shell, a pressure sensing head, a lower circuit board, an upper circuit board, a plurality of conductive springs and a spring holder, and is characterized in that the pressure sensing head is arranged in the shell, is blocked and fixed at one end of the inner side of a pressure channel, and is used for generating a corresponding electric signal in response to the pressure of a pressure medium to be measured; the lower circuit board is electrically connected to the pressure sensitive head; the upper end and the lower end of the conductive spring electrically abut against the surface of the lower circuit board and the surface of the upper circuit board respectively. And the spring retaining seat is detachably and fixedly arranged in the shell, is positioned between the lower circuit board and the upper circuit board, and is used for centralizing the conductive spring so as to prevent the two ends of the conductive spring from being extruded by the lowe