Submerged equipment position indicating mark

The invention relates to a position indicating mark for sinking equipment. The position indicating mark comprises a raft shell, an immersed breathable water inlet valve, a gas storage bottle, an automatic inflation valve, an inflatable air bag, a connecting rope and a rope storage winch. The raft shell comprises an upper raft shell and a lower raft shell which are connected into a whole through a connecting piece; at least two immersed breathable water inlet valves are fixed to the top of the upper raft shell, and the bottoms of valve shells are fixed to water surface equipment. If a water surface sinking accident occurs, after the position indicating mark of the sinking equipment is soaked in water, water enters the valve shell from the immersed breathable water inlet valve, after the water in the valve shell reaches a certain amount, the automatic inflation valve is started, the air storage bottle is opened to inflate the inflatable air bag, the inflatable air bag continuously expands to emerge from the wat