The invention discloses portable water emergency equipment. The portable water emergency equipment comprises a pressure bearing device, a gas bag, a fixing device and a fixing strap; the gas bag is fixed into the pressure bearing device, compressed gas is introduced into the air bag, and the pressure bearing device is fixed to a carrier through the fixing strap and provided with a spring locking device; the fixing strap is fixed and locked by the fixing device. By means of the portable water emergency equipment, the problem that emergency equipment is not easy to carry in the swimming time can be solved, the whole structure is light, the size is small, and the compressed gas is introduced into the gas bag in advance, so that the pressure inside the gas bag is greater than the external atmospheric pressure, when an upper casing is opened, the gas bag can expand to the maximum size instantly, the human body is lifted up rapidly to float on the water surface, and the equipment has the advantages of being safe, reliable, convenient to carry and the like. The portable water emergency equipment is widely applied to such scopes as water self rescue and water emergency rescue.