The present invention provides a system for detecting a liquid level and an air pressure, and a cleaning and disinfecting cabinet, which relate to the field of cleaning and disinfecting apparatuses. The cleaning and disinfecting cabinet is provided with a cleaning tank, and further comprises a liquid circulation system and a control system； the liquid circulation system comprises a water outlet mechanism, a water outlet hole being provided at the bottom of the cleaning tank, one end of the water outlet mechanism being in communication with the cleaning chamber by means of the water outlet hole. The liquid level and air pressure detection system comprises a first detection tube and a pressure sensor, one end of the first detection tube being in communication with the water outlet mechanism, the other end of the first detection tube being in communication with the pressure sensor, and the pressure sensor being connected to the control system. Said device can preset a plurality of liquid levels according to liquid level detection requirements, and can meet the cleaning and disinfecting requirements of different numbers of instruments； furthermore, under the control of a control system program, the whole cleaning and disinfecting process can ensure that an instrument which is difficult to clean, such as an instrument having a blind end, can be cleaned without missing dead space. The present invention is able to be used for cleaning high value-added precision medical instruments which are difficult to clean by a traditional device.La présente invention concerne un système pour détecter un niveau de liquide et une pression d'air, et une armoire de nettoyage et de désinfection, qui se rapportent au domaine des appareils de nettoyage et de désinfection. L'armoire de nettoyage et de désinfection est pourvue d'un réservoir de nettoyage, et comprend en outre un système de circulation de liquide et un système de commande； le système de circulation de liquide comprend un mécanis
