The utility model provides a hydrogen chloride gas drying device, which comprises a tower body, the top of the tower body is provided with a hydrogen chloride gas outlet, the bottom is provided with a chlorosilane liquid outlet, and the tower body is also provided with a hydrogen chloride gas inlet, a chlorosilane liquid inlet, and a refrigerant The inlet and the refrigerant outlet, and the hydrogen chloride gas inlet are equipped with pipes which extend downward in the tower body. The refrigerant inlet and the refrigerant outlet are arranged in the lower part of the tower body, and the refrigerant inlet and the refrigerant outlet are communicated with each other through an inner coil. The water-containing hydrogen chloride of the utility model fully contacts the chlorosilane sprayed from the chlorosilane liquid inlet through the hydrogen chloride gas inlet, so that the water reacts to generate hydrogen chloride. The device has the advantages of simple structure, low cost, convenient production and implementation, and can meet the requirement of dehydration depth, and pure hydrogen chloride gas can be obtained by separating chlorosilane.
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