The invention discloses a sulfur hexafluoride gas density relay, and relates to the technical field of relays controlled by Bourdon tube actions. The sulfur hexafluoride gas density relay comprises acasing, a signal control part and an indicating value display part, wherein the signal control part and the indicating value display part are arranged in the casing; the signal control part comprisesa control Boudon tube, a base, a control terminal base, a plurality of signal generators and a signal triggering mechanism; the indicating value display part comprises a display Boudon tube, a displayterminal base, a machine core and a pointer; the control Boudon tube and the display Boudon tube are vertically stacked, and a gap is maintained between the control Boudon tube and the display Boudontube; the signal triggering mechanism is vertical to the control Boudon tube and display Boudon tube; the signal generators are parallel with the Boudon tube. The sulfur hexafluoride gas density relay has the advantages that the control Boudon tube and the display Boudon tube are controlled to be the stacked arrangement, so that the appearance of the sulfur hexafluoride gas density relay is thin;the double-temperature compensation function is realized, and the accuracy is high.