The invention provides a medical waste anesthetic gas receiving device, and relates to the field of medical equipment. The medical waste anesthetic gas receiving device comprises a central negative pressure device, a gas inlet pipe and an air bag, the lower end of the gas inlet pipe is communicated with a connecting pipe, the left end of the connecting pipe is communicated with the upper end of a left branch pipe, the lower end of the left branch pipe is communicated with the central negative pressure device, and the right end of the connecting pipe is communicated with a right branch pipe; a gas outlet branch pipe is arranged on the right branch pipe, a circular piece is arranged at the lower end of the right branch pipe, a gas hole is formed in the circular piece, and a valve is arranged above the circular piece; a pipeline is communicated with the air bag, the lower end of the pipeline is located in a detector, a plug is arranged at the lower end of the pipeline, a sliding block is arranged in the pipeline, the plug is connected with the sliding block through a spring, and a gas outlet is formed in the right end of the pipeline. The medical waste anesthetic gas receiving device has the advantage that the waste anesthetic gas can be received safely and effectively.