Coal washing and dressing method

The invention provides a coal washing and dressing method. The coal washing and dressing method comprises the following steps that S1, raw coal is spread through a distributor; s2, the spread raw coal is put into a jigger to be sorted; s3, separating large-particle-size slime water and small-particle-size slime water from the slime water through a concentration cyclone; s4, sulfur sand and spiral coal water are separated from the large-granularity slime water through a spiral separator, slack coal and slack coal water are obtained through spiral coal water separation, the slack coal enters a clean coal belt, and the slack coal water is conveyed back to the coal water pool; s5, flotation clean coal and flotation coal water are separated from the small-particle-size slime water through flotation, flotation clean coal is squeezed to obtain flotation clean coal briquettes, the flotation clean coal briquettes are stirred into flotation clean coal powder, the flotation clean coal powder enters a clean coal belt, th