Abstract: Disclosed are a preparation process and an automatic filling apparatus for ceramic slurry of an explosion-proof thermistor. The automatic filling apparatus includes a slurry stirring and conveying device, a ceramic housing arranging and conveying device, a primary filling mechanism, a secondary filling mechanism, and a chip inserting mechanism, where the primary filling mechanism and the secondary filling mechanism are arranged at a left end and a right end of the ceramic housing arranging and conveying device respectively, the chip inserting mechanism is arranged between the primary filling mechanism and the secondary filling mechanism, and the slurry stirring and conveying device is connected to the primary filling mechanism and the secondary filling mechanism. The present automatic filling apparatus realizes streamlined continuous filling of the ceramic slurry of the explosion-proof thermistor. Accordingly, a filling efficiency of the explosion-proof thermistor is improved.