The invention discloses a calibration process of a calibrator of an SF6 density relay and comprises the following steps: step 1, the process is started; step 2, a self check is carried out; step 3, an instruction is chosen from the choices of calibration preparation, data query, time setting, pressure conversion, help viewing and device marking; if the calibration preparation is chosen, a step 3.1 is carried out, and in the calibration preparation, a step 3.11 is firstly implemented to set a number for the test object; then a step 3.12 is carried out to select a number of contact points; a step 3.13 is carried out after one item is selected, in which a nominal parameter is set; then a step 3.14 is carried out to adjust the pressure to a nominal value; after that, a step 3.15 is carried out to start a calibration; a step 3.16 is carried out after the calibration is finished, which chooses whether to end the calibration or not; if the choice is no, the invention returns to a step 3.14, while if the choice is yes, the invention turns to a step 3.17 to store and print the result. The invention has the advantages of simple operation, fitting for on-site calibration processes, and labor-saving property and convenient using.