▎ 摘　　要

NOVELTY - The life jacket has a life jacket main portion (1) whose manufacturing cloth is made of high-strength waterproof fabric. The cloth is divided into an inner layer cloth (2), a middle layer cloth (3) and an outer layer cloth (4). The inner layer cloth and the middle layer cloth constitute a waterproof inner layer sealing cavity. The middle layer fabric and the outer layer fabric form a waterproof outer layer sealing cavity. The outer layer sealing cavity is filled with floater. The inner layer sealing cavity is provided with two friction heat generating sheets. The first friction heat generating sheet is fixedly installed on the inner layer cloth. The second friction heat generating sheet is fixedly installed on the middle layer cloth. The first friction heat generating sheet and the second friction heat generating sheet are parallel and have a certain distance, when the inner layer sealing cavity is completely swollen. The middle layer cloth is a heat insulation cloth. USE - Automatic heating and warm-keeping life jacket. ADVANTAGE - The impact force of the seawave is effectively used, and the friction heat generating sheets rubs against each other to generate heat and conduct heat to the inner layer, and automatically provide heat preservation for the falling water personnel. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the automatic heating and warm-keeping life jacket. 1Life jacket main portion 2Inner layer cloth 3Middle layer cloth 4Outer layer cloth 11Buckle belt