Projector capable of being used for underwater working

The invention discloses a projector capable of being used for underwater working. The whole projector is sealed in a waterproof box body shell made of heat conducting materials. A liquid cooling device and a semiconductor cooling device are arranged in the projector, a sealed type cooling system is formed, and the liquid cooling device and the semiconductor cooling device are both connected with the box body shell. The waterproof projector is of a sealed type structure, the sealed waterproof box body shell made of the heat conducting materials can guarantee the fact that the whole projector is tight without water leakage, moisture-resistant and dustproof effect is achieved, and heat in a box body can be conducted out of the box body shell. The liquid cooling device and the semiconductor cooling device are arranged in the projector to form the sealed type cooling system, and accordingly the problem of radiating cooling of a sealed structure is solved. The projector completely overcomes the shortcomings in the prior art and can be completely used for underwater working and be completely suitable for being used in various bad environments such as a wet sealed environment, an environment with a large amount of dust, a high-temperature environment and an environment with bad radiating.