The invention provides an iron bath method high temperature gas waste heat and waste energy utilization and a dry method dedusting technology, and belongs to the field of high temperature gas recovery processing technology. The invention comprises the following steps: cooling gas from an iron bath furnace by a water cooling smoke cover; carrying out coarse dedusting by a cyclone dust collector; cooling by a gas-gas heat exchanger; carrying out secondary dedusting of cooled gas by a cloth bag deduster; mixing one part of purified gas and high heating value gas, and combusting the mixed gas from a gas branch pipe by a combustion gas boiler for generating; using the other part of purified gas from the gas branch pipe as fuel in a hot-blast stove for producing hot blast from the iron bath furnace; discharging flue gases from the hot-blast stove and the combustion gas boiler. The invention has the advantages of high efficiency recovery of waste heat and waste energy with high temperature and net heat value, high efficiency of energy recovery and good effect of dedusting.