Preparation process of ceramic membrane and co-extrusion die

In order to solve the problems of high energy consumption of secondary sintering of a ceramic membrane and low bonding strength of a separation layer and a support body in the prior art, the invention discloses a preparation process of a ceramic membrane, which comprises the processes of material preparation, co-extrusion, drying, low-temperature glue removal, sintering and the like. An extrusion die comprises a fixing plate, a mouth die and a forming column, wherein a first feeding hole is formed in the fixing plate; a through runner and a non-through annular runner are formed in the mouth die in the extrusion direction, and a second feeding hole is formed in the side wall of the mouth die; the forming column is arranged inside the runner along the extrusion direction, and one end is connected with the fixed plate. According to the preparation process and the extrusion die of the ceramic membrane provided by the invention, the support body pug and the separation membrane pug are co-extruded and then sintered