A high-precision gas density relay, comprising: a housing, a base arranged in the housing, an end seat, a Bourdon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of microswitches (91, 92, 93), wherein the plurality of microswitches (91, 92, 93) are used as signal generators, a first end of the Bourdon tube being connected to the base, a second end of the Bourdon tube being connected to the end seat, a first end of the temperature compensating element being connected to the end seat, a second end of the temperature compensating element being connected to the signal adjusting mechanism; characterized in that, a microswitch of the plurality of microswitches (91, 92, 93) is a button micro switch; the high-precision gas density relay further comprises a microswitch contact trigger element (201, 202, 203) made of an elastic material, a first end of the microswitch contact trigger element (201, 202, 203) being fixed inside the housing, a second end of the microswitch contact trigger element (201, 202, 203) being arranged corresponding to a button (9101, 9201, 9301) of the button microswitch and abutting the button (9101, 9201, 9301) of each microswitch of the plurality of microswitches (91, 92, 93) in one-to-one correspondence; when a gas density value changes, the Bourdon tube and the temperature compensation element generate a plurality of displacements, wherein the plurality of displacements drive the microswitch contact trigger element (201, 202, 203) through a signal trigger mechanism; when the gas density value reaches a corresponding set value, the microswitch contact trigger element (201, 202, 203) presses or moves away from the button (9101, 9201, 9301) of the microswitch of the plurality of micro switches, causing the microswitch of the plurality of microswitches (91, 92, 93) to generate a corresponding signal, by causing the microswitch of the plurality of microswitches (91, 92, 93) to generate the corresponding signal, the microswitch contact trigger element (201, 202, 203) completes a function of the gas density relay; and when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate a plurality of corresponding displacements, wherein the plurality of corresponding displacements drive the microswitch contact trigger element (201, 202, 203) through the signal trigger mechanism; the microswitch contact trigger element (201, 202, 203) is reset to a state when the gas density is normal. a housing, a base arranged in the housing, an end seat, a Bourdon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of microswitches (91, 92, 93), wherein the plurality of microswitches (91, 92, 93) are used as signal generators, a first end of the Bourdon tube being connected to the base, a second end of the Bourdon tube being connected to the end seat, a first end of the temperature compensating element being connected to the end seat, a second end of the temperature compensating element being connected to the signal adjusting mechanism; characterized in that, a microswitch of the plurality of microswitches (91, 92, 93) is a button micro switch; the high-precision gas density relay further comprises a microswitch contact trigger element (201, 202, 203) made of an elastic material, a first end of the microswitch contact trigger element (201, 202, 203) being fixed inside the housing, a second end of the microswitch contact trigger element (201, 202, 203) being arranged corresponding to a button (9101, 9201, 9301) of the button microswitch and abutting the button (9101, 9201, 9301) of each microswitch of the plurality of microswitches (91, 92, 93) in one-to-one correspondence; when a gas density value changes, the Bourdon tube and the temperature compensation element generate a plurality of displacements, wherein the plurality of displacements drive the microswitch contact trigger element (201, 202, 203) through a signal trigger mechanism; when the gas density value reaches a corresponding set value, the microswitch contact trigger element (201, 202, 203) presses or moves away from the button (9101, 9201, 9301) of the microswitch of the plurality of micro switches, causing the microswitch of the plurality of microswitches (91, 92, 93) to generate a corresponding signal, by causing the microswitch of the plurality of microswitches (91, 92, 93) to generate the corresponding signal, the microswitch contact trigger element (201, 202, 203) completes a function of the gas density relay; and when the gas density value returns to normal, the Bourdon tube and the temperature compensation element generate a plurality of corresponding displacements, wherein the plurality of corresponding displacements drive the microswitch contact trigger element (201, 202, 203) through the signal trigger mechanism; the microswitch contact trigger element (201, 202, 203) is reset to a state when the gas density is normal.