The utility model discloses a circulating entrained-flow bed device for modifying titanium concentrate capable of realizing continuous production. The circulating entrained-flow bed device comprises an entrained-flow bed reactor, a titanium concentrate feeding system, a gas inlet system, a waste heat utilizing system and a discharging system, wherein the entrained-flow reactor comprises an oxidizing roasting entrained-flow bed reactor and a reduction roasting entrained-flow bed reactor, each entrained-flow bed reactor comprises an airflow distributing section, a gas-solid reaction section, an airflow sorting section and a discharging section and is provided with a gas inlet, a modified gas inlet, a titanium concentrate feeding port, a returning material feeding port, a tail gas outlet and a material outlet, and the material outlet comprises a large-specific-gravity material outlet and a small-specific-gravity material outlet. By adopting the circulating entrained-flow bed device, the requirement on the granularity of raw materials is low, the applicability is strong, the reaction is adequate and rapid, the production efficiency is high, the production period is short, the energy consumption is low, simplicity in operation is realized, and the modification effect is good.