The electric contact pressure gauge is used to measure the positive and negative pressure of the gas and liquid medium that have no corrosive effect on copper and copper alloy, and send out the signal when the pressure reaches the predetermined value, close the control circuit, and achieve the purpose of automatic control alarm. On the electric contact signal needle of the electric contact pressure gauge device, there is an adjustable magnetic steel, which can increase the contact suction and accelerate the contact action, so as to make the contact reliable, remove the arc, and avoid the frequent cut-off of the contact caused by the vibration of the working environment or the pressure pulsation of the medium. Therefore, the electric contact pressure gauge has the advantages of reliable action, long service life and large power of contact switch.