The utility model discloses a bag-type dust remover for dust removal of main flue gas in a metallurgical rotary hearth furnace. The bag-type dust remover comprises a gas collection chamber, a gas distribution chamber, a middle tank body and a dust hopper, wherein the gas distribution chamber is directly communicated with the dust hopper; the dust hopper is fixed on a bracket; the top of the dust hopper is positioned at the bottom of the middle tank body; the gas distribution chamber is directly communicated with the middle tank body; an upper tank body is arranged above the middle tank body and communicated with the gas collection chamber; a filter device is arranged in the middle tank body. According to the bag-type dust remover for dust removal of the main flue gas in the metallurgical rotary hearth furnace, the dust hopper is directly communicated with the gas distribution chamber, and viscous dust directly enters the dust hopper under the action of gravity, so that defects of high possibility of blockage and accumulation in an original structure are overcome; as the gas distribution chamber is communicated with a small part of the dust hopper, the gas flow speed of entry of gas flow in the gas distribution chamber into the dust hopper is greatly reduced, dust in the gas flow is fully settled under the action of gravity, and the dust removal efficiency is high.