The utility model discloses a sulfur hexafluoride gas density relay, which comprises a casing, a machine seat, an end seat, a Bourdon tube, a temperature compensating element and a plurality of micro switches serving as signal generators of a gas density relay, wherein one end of the Bourdon tube is connected to the machine seat, the other end of the Bourdon tube is connected with one end of the temperature compensating element through the end seat, the micro switches are mounted on the machine seat or in the casing, and provided with contact point operating handles, the gas density relay further comprises a displacement amplification mechanism, the initiating terminal of the displacement amplification mechanism is connected with the other end of the temperature compensating element, and an amplification end of the displacement amplification mechanism can drive the contact point operating handles of the micro switches so as to enable the contact points on the micro switches to be connected or disconnected; and when the gas density value varies, the Bourdon tube and the temperature compensating element generate displacements, the displacements can be sent to the micro switches after being amplified through the displacement amplification mechanism, so that the micro switches are enabled to sent out corresponding signals, and the functions of the gas density relay are fulfilled.