An acid purifier, comprising: a container (1) for an acid to be purified; a heater (2); a condenser (3) including a Peltier semiconductor cooler, a condenser body (600) and a refrigerant temperature sensor; a purified acid liquid collection bottle (4) connected with the condenser; a controller; an integrated liquid level control component (300) for the acid to be purified, connected with the container (1) for the acid to be purified, and arranged in such a way that a liquid level pipe (320), a liquid adding funnel (310) and a waste liquid discharge valve (330) are integrated; and an acid liquid temperature sensor (400, 500) arranged in the acid to be purified.