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 the technical 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; the other 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.