Abstract: Provided is a portable artificial respirator, which is manufactured in a compact size without a closing and opening device such as a valve so as to be easily portable, and is configured to internally pressurize the lung and the chest through the trachea and mouth of a human body when an emergency occurs. The portable artificial respirator has a flexible air chamber which is a cylinder-shaped chamber having an opened air passage formed only on the lower part, and has a plurality of folds on the main periphery to be folded and compressed by the pressure applied to the lower part, and restored when the pressure is released to be inflated to the upper part. An expandable outer peripheral structure is formed on the air passage. A mask of a flexible silicone rubber sheet, which closes the rear side of the inside or inner cavity and has a respiration hole which communicates with the air passage formed thereon, is connected thereto.