The invention discloses a coke tar distillation process. The coke tar distillation process comprises the following steps: (1) mixing raw material coke tar with a dehydrating agent, heating the mixture, carrying out dehydrating treatment under the condition that the electric field intensity is 2,000-3,000 V/cm for 60-75 min, and removing liquid supernatant after layering to obtain dehydrated coke tar; (2) placing the dehydrated coke tar in a 1# distillation tower, carrying out distillation under the condition of normal pressure, removing light oil distillate, then heating, producing carbolic oil fraction on the top of the tower, and cutting naphthalene oil fraction on a side line; and (3) heating mixed oil obtained from the bottom of the 1# distillation tower via a tubular heating furnace,then feeding the mixed oil into a 2# distillation tower, producing heavy scrubbing oil fraction on the top of the tower under the condition of reduced pressure, cutting first anthracene oil fraction and second anthracene oil fraction from a side line, and producing medium-temperature pitch from the bottom of the tower. The distillation process is good in dehydrating effect, simple to operate and low in cost, is energy-saving and environmentally friendly, and is suitable for large-scale coke tar processing engineering.