The invention relates to a comprehensive application of waste cathode carbon blocks in an aluminum electrolyte bath and a method thereof, wherein the waste cathode carbon blocks are mainly applied toelectrically conductive and heating materials between an anode and a cathode in the electric baking of the aluminum electrolyte bath, so that the invention belongs to the aluminum electrolyte bath baking material technical field. The waste cathode carbon blocks in an aluminum electrolyte bath are applied to electrically conductive materials of the anode and the cathode in the baking of the aluminum electrolyte bath. The application method is as follow: 1. the waste cathode carbon blocks in an aluminum electrolyte bath are coarsely crushed and steel bars, fireproof materials and electrolytes, etc. of the waste cathode carbon blocks are separated out; 2. the waste cathode carbon blocks which are separated are crushed to become grains with a granularity of between 1 and 5mm; 3. the waste cathode crushing materials with different electric conductivity are placed in the aluminum electrolyte bath, and the current distribution is adjusted after electrification; 4. the waste cathode grains areremoved by oxidation or carbon residue dredging. In the invention, the waste cathode carbon blocks in the aluminum electrolyte bath are used as electrically conductive and heating materials between the anode and the cathode in the electric baking of the aluminum electrolyte bath, which realizes the innocent treatment and the comprehensive utilization of waste harmful cathodes, reduces the consumption of petroleum coke and saves resources.