The invention relates to a miniaturized energy-saving evaporative regeneration device. The device comprises a stock solution box, a concentrated solution box, a distillation still, a heat pump unit, a first heat exchanger, a second heat exchanger, a cooling fan and a steam-liquid cooling box; the distillation still comprises a main distillation still body and an auxiliary distillation still body, a first heating chamber and a first stock solution inlet are formed in the main distillation still body, and a first steam outlet is formed in the top of the main distillation still body; an outlet of the heat pump unit is connected with an inlet of the first heating chamber, an inlet of the heat pump unit is connected with a cooling medium outlet of the steam-liquid cooling box, and a cooling medium inlet is connected with an outlet of the first heating chamber through the cooling fan; an inlet of a second heating chamber of the auxiliary distillation still body is connected with the first steam outlet, an outlet of the second heating chamber is connected with a second steam-liquid inlet, a second vacuum pump is connected with a steam-liquid outlet, a second steam outlet is connected with a first steam-liquid inlet, and a second stock solution inlet communicates with the stock solution box. The miniaturized energy-saving evaporative regeneration device is small in size, low in investment and energy consumption, wide in application range and suitable for the industries of chemical engineering, pharmacy, water treatment and the like.