The optical density sensor protective case disclosed in the present application includes an outer cover and a bubble membrane part fitted into the outer cover; A convection hole is opened in the outer cover; A liquid inflow hole is opened in the bubble membrane. Further disclosed is an optical density measuring device including the protective case. By protecting the sensor body by arranging a protective case, the sensor body is prevented from being damaged by collision or compression in one direction, thereby extending the service life of the sensor body, and in the other direction, the solution to be measured inside the protective case is By approaching the stop, the precision of the measurement result is improved. In addition, by arranging the pore membrane on the outside of the outer cover, it prevents the solution to be measured from directly entering the measurement area during the injection process, and also prevents contaminants such as dust from entering the measurement area and affecting the accuracy of the measurement result. Ensure the reliability of the measurement results.
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