The invention relates to the technical field of coal gasification, and particularly relates to a formed coke preparation method and a formed coke. The method is characterized in that fly ash and heavytar are modified and combined into high calorific value formed coke for gasifying, and thus the economic benefit can be increased. The formed coke preparation method provided in the embodiment comprises the following steps: modifying the fly ash, and removing hydrophilic functional groups in the fly ash so as to obtain a hydrophobic carbon molecular porous skeleton; homogenizing water and dust containing heavy tar to obtain emulsified tar; mixing the modified fly ash and the emulsified tar; stirring; separating water; and pressurizing to mold a solid-phase product to obtain the formed coke. The method is applicable to recycling of the fly ash and the heavy tar.