A method for preparing coal for coke making, in which an individual brand of coal or caking additive is prepared at a time prior to arrival at a coal yard disposed in a coke plant, the individual brand of coal or caking additive being used alone or in mixture with another coal as a raw material for coke making, wherein, on the basis of a relationship between a critical permeation distance and a Gieseler maximum fluidity, the relationship being obtained from permeation distances and values of Gieseler maximum fluidity of one or more brands of coal or caking additive, when a permeation distance of the individual brand of coal or caking additive is larger than or equal to a critical permeation distance calculated from a Gieseler maximum fluidity of the individual brand of coal or caking additive on the basis of the relationship between the critical permeation distance and the Gieseler maximum fluidity, a size of particles of the individual brand of coal or caking additive is controlled at the time prior to arrival at the coal yard, so that a content of particles having a diameter of 6 mm or more in the individual brand of coal or caking additive, the content being determined from a Hardgrove grindability index HGI of the individual brand of coal or caking additive using Expression below, is achieved: Content mass % of particles having a diameter of 6 mm or more ≤ 30 + 0.5 × HGI − 60 wherein the permeation distance being measured by the conditions of: - packing a lower portion of a vessel with coal to form a sample, - disposing a through-hole material on the sample, - heating the sample while applying a constant load on the coal sample and a through-hole material having through holes from top to bottom surfaces or while keeping the volumes of the coal sample and a through-hole material constant to a temperature of softening-beginning temperature or more causing the sample to permeate through the through-hole material, wherein heating is performed in an inert gas atmosphere, and - measuring the permeation distance of the sample which has permeated through the through-hole material, and wherein the critical permeation distance is calculated using Expression below: Critical permeation distance = 1.3 × a × log MFc where "a" represents a constant 0.7 to 1.0 times a coefficient of log MF in a regression line crossing an origin point, the regression line being obtained using permeation distances and values of log MF of one or more coals that fall within a range of common logarithm of Gieseler maximum fluidity log MF < 2.5, and MFc represents a Gieseler maximum fluidity (ddpm) of the coal or caking additive to be prepared. - packing a lower portion of a vessel with coal to form a sample, - disposing a through-hole material on the sample, - heating the sample while applying a constant load on the coal sample and a through-hole material having through holes from top to bottom surfaces or while keeping the volumes of the coal sample and a through-hole material constant to a temperature of softening-beginning temperature or more causing the sample to permeate through the through-hole material, wherein heating is performed in an inert gas atmosphere, and - measuring the permeation distance of the sample which has permeated through the through-hole material, where "a" represents a constant 0.7 to 1.0 times a coefficient of log MF in a regression line crossing an origin point, the regression line being obtained using permeation distances and values of log MF of one or more coals that fall within a range of common logarithm of Gieseler maximum fluidity log MF < 2.5, and MFc represents a Gieseler maximum fluidity (ddpm) of the coal or caking additive to be prepared.