The utility model discloses an acid-containing tail gas washing device which comprises a condenser, a Venturi pipe, a water inlet pipe, a separator and a connecting elbow part, wherein a tail gas inlet, a cooling water inlet below the tail gas inlet, a washing water outlet below the tail gas inlet and a gas outlet above the cooling water inlet are formed in the condenser; the upper end opening of the Venturi pipe is a gas inlet, the lower end opening of the Venturi pipe is a discharging hole, and the gas inlet of the Venturi pipe is connected with the gas outlet of the condenser; the water inlet pipe is tangentially connected to the upper part of the Venturi pipe, so that washing water can tangentially enter the upper part of the Venturi pipe; a feeding hole, a liquid outlet and a gas outlet are formed in the separator; the connecting elbow part is connected with the lower end opening of the Venturi pipe and tangentially connected to the feeding hole of the separator. The acid-containing tail gas washing device disclosed by the embodiment of the utility model has the advantages of high acid mist removal efficiency, simple structure, low manufacturing cost and the like.