The invention relates to a special graphite cathode for an ionic-membrane electrolysis tank. The special graphite cathode comprises a graphite plate, wherein water circulating grooves are formed in a front face of the graphite plate, and flow guiding grooves are formed in a rear face of the graphite plate; a material outlet hole and a water outlet hole are formed in the upper part of a left end face of the graphite plate, a material inlet hole and a water inlet hole are formed in the lower part of a right end face of the graphite plate, the material outlet hole is communicated with the upper part of the flow guiding grooves, the material inlet hole is communicated with the lower part of the flow guiding grooves, the water outlet hole is communicated with the upper part of the water circulating grooves, and the water inlet hole is communicated with the lower part of the water circulating grooves; an annular sealing groove is formed in the front face of the graphite plate and is located around the water circulating grooves. The special graphite cathode has a cooling water circulating structure and a cathode material liquid flow guiding structure, so that the graphite cathode, an anode and material liquid can be cooled, the circulation and uniform distribution of cathode material liquid can be accelerated, the escape of hydrogen gas is facilitated, the service life of the graphite cathode and the service life of the anode are prolonged, and the current efficiency and product quality are improved.