Abstract: A 400 kA high energy efficiency reduction pot, comprising: anode carbon blocks, anode busbars, crust breaking and feeding device, anode lifting device, girders and pillars, pot hooding and exhausting system, cathode busbar arrangement structure, cathode carbon blocks, cathode lining structure and cathode pot shell, the pot is characterized in that: 1) superstructure and portal-type pillars are supported by pipe truss girders structure; 2) anode carbon block has eight steel stubs to be configured in a symmetrical mode; 3) the superstructure has 24 double-anode assemblies or 48 single-anode assemblies, six alumina feeding points, and two fluoride salt feeding points; 4) sub-section fume collecting and exhausting system is installed between a horizontal hood plate and a feeding hopper; 5) a device for sealing the anode rod by means a negative pressure suction is provided; 6) a new lining structure of holding heat on bottom, dispersing heat from side, and adding expansion layer at the cathode end have been design