The embodiment of the utility model discloses a medical bad breath collector. The medical bad breath collector at least comprises a bad breath gatherer and a liquid storage barrel, wherein the bad breath gatherer at least comprises a communication device, a backflow guide pipe, a buffer bottle, an air outlet pipe, a liquid storage barrel ground plug, an air guide pipe and an air flow disperser; when bad breath is collected, the liquid storage barrel ground plug is placed at a barrel opening of the liquid storage barrel and seals the liquid storage barrel; the air flow disperser is positioned at the bottom of the liquid storage barrel but is not in contact with the bottom surface of the liquid storage barrel; the air guide pipe conveys the bad breath into the liquid storage barrel through the air flow disperser; the bad breath reacts with a reaction solution in the liquid storage barrel so as to be collected. After the adoption of the medical bad breath collector provided by the utility model, the bad breath of a patient can be easily and quickly collected.