The invention discloses a medical vaporizer, and relates to the field of medical appliances. The medical vaporizer comprises a face mask and a mist spray pipe communicated with the face mask, wherein the mist spray pipe is communicated with a medicine liquid cavity, a vibrating film is arranged in the medicine liquid cavity, the medicine liquid cavity is connected with an air pipe, the face mask is connected with the mist spray pipe through a connecting pipe, and the connecting pipe is bent; a one-way valve is arranged in the mist spray pipe, and an expiration one-way valve is arranged on the face mask. Compared with the prior art, the face mask and the mist spray pipe of the medical vaporizer are not arranged in the same horizontal direction, atomization can be conducted on a patient when the patient is at a recumbent position, the mist spray pipe is arranged at the position parallel to or lower than an air channel inlet all the time, and the phenomenon that the patient is choked by atomized water drops, so that asphyxia is caused can be avoided; due to the fact that the one-way valve is arranged in the mist spray pipe, the phenomenon that gas exhaled by the patient flows backwards to enter the medicine liquid cavity, so that contamination is caused is avoided; in addition, due to the fact that the expiration one-way valve is arranged on the face mask, the gas exhaled by the patient can be exhausted through the expiration one-way valve, and accumulation of carbon dioxide is avoided.