Continuous purification process of methylbenzotriazole

The invention provides a continuous purification process of methylbenzotriazole. The continuous purification process comprises the following steps of feeding a coarse material into a low fraction removing tower T1 through a pump P1 for gas-liquid exchange, feeding a high-boiling point material at the bottom of the tower to the middle part of a product tower through a heating part by virtue of a pump P2 for rectification and separation, and after the heat exchange of the material in the product tower, feeding a high-boiling point material part into a high-boiling material storage tank V5A/V5B through a pump P5, and then discharging the material. The continuous purification process of methylbenzotriazole is capable of improving the quality of the product, improving the productivity, saving energy and reducing consumption; the continuous purification process is stable in quality; therefore, the cost is reduced and the economic benefit is improved.