The utility model discloses a continuous crystallization device for a high-acidity thermal crystallization substance. The device comprises a steam heater (1), a crystallizer (2), an efficient concentration evaporator (3) and an automatic control system, an axial liquid inlet pipe (4) is arranged at the lower part of the crystallizer; the top of the liquid inlet pipe is covered with a coaxial flowguide pipe (5) extending to the top of the crystallizer, the steam heater is connected to a feeding port of the axial liquid inlet pipe of the crystallizer through a liquid inlet pipeline (6), the crystallizer is connected with the efficient concentration evaporator through a section of straight pipe (7), and a crystal separation discharging port (10) is formed in the bottom of the crystallizer; asteam outlet (8) and a vacuum pump (11) are arranged at the top of the high-efficiency concentration evaporator; and a material transfer circulating pipeline (9) is connected between the upper part of the high-efficiency concentration evaporator and the steam heater. According to the utility model, continuous concentration and crystallization of high-acidity thermal crystallization substances canbe realized, stable process and efficient operation of the device can be ensured, the production efficiency is improved, the labor intensity of workers is reduced, and the product quality is improved.