The invention discloses a digital gas density meter with a temperature compensation function, which comprises a mechanical measurement device, a mechanical momentum sensing device, an electronic loop, a temperature compensation device and a display device, wherein the mechanical measurement device is used for measuring density of an insulation gas; the mechanical momentum sensing device is coupled with the mechanical measurement device, and is used for sensing the mechanical momentum of the mechanical measurement device; the electronic loop is coupled with the mechanical momentum sensing device; the temperature compensation device is coupled with the electronic loop; the display device is coupled with the electronic loop; the temperature compensation device comprises a temperature sensor and a compensation module coupled with the temperature sensor; and the compensation module comprises compensation parameters of various insulation gases in various temperature ranges. According to the invention, the measurement results of a mechanical gas density meter are presented in digital value so as to be convenient to determine and read for users; and additionally, the temperature compensation device can compensate gas density metering error caused by temperature variations, and can improve the measurement accuracy.