The invention discloses an immersed fuel spraying gun. The immersed fuel spraying gun comprises an oil pipe, an atomization wind pipe and a combustion assisting wind pipe. A pipe cavity of the oil pipe is a fuel channel for conveying fuel. The atomization wind pipe sleeves the oil pipe; and an atomization channel for conveying atomization gas is defined between the atomization wind pipe and the oil pipe. The combustion assisting wind pipe sleeves the atomization wind pipe; and a combustion assisting channel for conveying combustion assisting gas is defined between the combustion assisting windpipe and the atomization wind pipe. The combustion assisting channel and the atomization channel are provided with a combustion assisting wind outlet and an atomization wind outlet at the same ends;a fuel spraying port is formed in the end, near the atomization wind outlet, of the fuel channel; and the fuel spraying port is arranged towards the atomization channel, so that fuel in the fuel channel is firstly sprayed to the atomization channel to mix with atomization gas, and the mixed gas is sprayed out from the atomization wind outlet. The immersed fuel spraying gun has the advantages of lower burning loss at the front end, lower blockage probability of the fuel spraying port, longer service life and better working reliability.