The invention relates to an ammonia-containing water-coal-slurry gasified ash water treatment method. The ammonia-containing water-coal-slurry gasified ash water treatment method is characterized by comprising the following steps that treated ash water is fed into a first upper column to be mixed with flash distillation gas from a first lower column and heated, after the pressure is increased to 0.2-0.4 MPaG, the ash water enters a second upper column to be mixed with flash distillation gas from a second lower column, and after the pressure is increased, the ash water enters a stripping towerfor stripping, wherein stripping gas is low-pressure steam and non-condensable gas; the non-condensable gas is injected into the stripping tower through an ejector; the ash water on the bottom of thestripping tower enters the second lower column and the first lower column for primary flash distillation and secondary flash distillation in sequence, the heat of the flash distillation gas obtained after flash distillation is recycled, and a liquid generated after the secondary flash distillation is fed into a down-stream wastewater treatment device. By means of the ammonia-containing water-coal-slurry gasified ash water treatment method, the problem is solved that due to scaling and blocking of a heat exchanger, the running period of the device is short, the energy consumption of the deviceis reduced, and the operation cost of the device is reduced.