The invention relates to a self-pressure type underwater material cutting and charcoal outputting machine. The self-pressure type underwater material cutting and charcoal outputting machine comprises a fed material mixing zone, a heavy material deposition zone, a charcoal and water mixing zone, a folding dehydrator and a water tank which is in butt joint with a dehydration outlet of the folding dehydrator. At least one spraying device used for spraying water to slag materials entering the fed material mixing zone is arranged in the fed material mixing zone. A first stirring device is arranged in the heavy material deposition zone and at least comprises a first upper blade and a first lower blade, and the axial inclination of the first upper blade and the axial inclination of the first lower blade are opposite. The heavy material deposition zone is further internally provided with a spiral conveyer of which the input end is located at the bottom of the heavy material deposition zone and the output end extends out of the heavy material deposition zone. A second stirring device is arranged in the charcoal and water mixing zone and at least comprises a second upper blade and a second lower blade, and the axial inclination of the second upper blade and the axial inclination of the second lower blade are opposite. The water tank is provided with a water pump used for pumping water in the water tank into the at least one spraying device.