The utility model relates to a distillation plant used for measuring sludge fatty acid. The distillation plant is characterized in that a flask is arranged on a bracket; a condensation tube matched with the flask is arranged on one side of the flask; the condensation tube and the flask are connected with each other through a flow guidance tube; an air escape valve is arranged on the stream guidance tube. During use, the air escape valve is additionally arranged on the stream guidance tube of the distillation plant, and the valve is quickly opened when a potential explosion hazard is detected, so that the environment in the distillation plant is communicated with the outer environment, the potential explosion hazard is eliminated, and the use safety of the distillation plant is guaranteed.