The invention discloses a cathode structure that an aluminium electrobath vertical cathode steel stick generates electricity which belongs to the aluminium electrolytic technique field. The cathode structure includes a cathode inside lining, a cathode carbon block and a cathode steel stick. The cathode carbon block locates in the cathode inside lining inner; the cathode steel stick vertical connects with the cathode carbon block bottom, and passes through the cathode inside lining bottom that can remove horizontal current in the cathode carbon block and the aliminium liquor, weaken fluctuation of aluminium liquor in the electrobath, increase working stability of the aluminium electrobath; in addition, the cathode carbon block bottom uses heat-resistance high-strength impermeable material that can avoid leakage and breakage of the electrobath caused by the aluminium liquor corrading the cathode steel stick.