The invention relates to an automatic protection apparatus, especially to a logic hard-wire interlocking apparatus for the slag-removing lock hopper of a gasification furnace. The logic hard-wire interlocking apparatus is characterized in that in an interlocking system, relay contacts of an outlet valve location feedback signal, a flushing water valve location feedback signal and a pressure release valve location feedback signal are connected in series and are respectively connected with a relay coil of an inlet valve, a relay coil of a circulating pump suction valve and a relay coil of a pressurizing valve, the relay coil of the inlet valve is connected with an inlet valve DCS contact, the relay coil of the circulating pump suction valve is connected with a circulating pump suction valve DCS contact, and the relay coil of the pressurizing valve is connected with a pressurizing valve DCS contact. The invention has the following advantages: traditional manual work and the modern advanced interlocking system are combined together and applied to the slag-removing lock hopper of the gasification furnace, bringing great improvement to the prior art; accidents and casualties are avoided, damage of equipment is prevented, continuous production time is prolonged, production capacity is improved, economic benefits are enhanced, and safety production is fundamentally guaranteed.