The invention relates to the technical field of field supplies, and particularly relates to a negative ion sleeping bag. Negative ions are delivered to the sleeping bag, so that the negative ions achieve a health-caring effect on a human body, a health index of the human body is improved, and meanwhile, through cooling the negative ions, a sleep bag body is convenient to cool, so that the sleepingbag can be conveniently used in a hot environment; and meanwhile, activity of the negative ions is reduced, the quantity of the negative ions absorbed by the human body is increased, comfort of the human body is improved, fatigue of the human body is relieved, and practicability and reliability are improved. The sleeping bag comprises the sleeping bag body, a first air pipe, a second air pipe, abox, a first motor, a suction pump, a third air pipe, a negative ion generator, a cooling pipe, a first connector, a fourth air pipe, an air storage cabin, a fifth air pipe, a compressor, a sixth airpipe, an exposure valve and a second connector, wherein the lower side of the right end of the sleeping bag body is communicating with the left output end of the first air pipe; the right input end ofthe first air pipe is communicating with the left output end of the second air pipe; and the box is positioned at the lower right side of the sleeping bag body.