The invention belongs to the technical field of ventilation wind pressure monitoring equipment of a vertical shaft pit shaft for mines or gate ways, in particular to a safe wingspan-type monitoring and alarming system of automatic on-off ventilation wind pressure for mines. The monitoring and alarming system monitors the ventilation state of the vertical shaft pit shaft or the gate way adopts thetechnical scheme of comprising a display system, a sensing mechanism and a double-wing mechanism, wherein the double-wing mechanism comprises a left wing and a right wind which are fixed on a bottom plate by hinges, and the left wing and the right wing are respectively provided with a beam; a spring construction member is fixed on the bottom plate and is a butterfly spring fixed on a spindle; theother end of the butterfly spring is clamped and connected with the beam; the wings in the double-wing mechanism contact with the sensing mechanism, and the sensing mechanism is connected with the display system. Wind pressure safe monitoring realizes the real-time monitoring of ventilation pressure in the air duct, and a display screen is used for displaying in real time so as to thoroughly solve the ventilation hidden danger existing in the existing mine pit shaft or gate way tunnelling.