The invention relates to the technical field of coal gasification production, and discloses a preparation method of gasification formed coke for a Lurgi furnace. The method specifically comprises thefollowing steps: pulverized coal with the particle size smaller than 3 mm is taken as a raw material, a coal gasification catalyst and the pulverized coal are mixed, and an adhesive is added to obtaina mixture, wherein the weight of the adhesive is 3-12% of that of the pulverized coal; and graphite is pressed into blocks, the mixture and the graphite are bonded together through carbonization, wherein the carbonization heating rate is 3-10 DEG C/min, the final temperature is 800-900 DEG C, and the constant-temperature time is 1-2 hours. According to the method provided by the invention, the graphite is used as a carrier to effectively react with formed coke, so that coal ash is reduced, the tail water treatment difficulty is reduced, the coal gasification conversion efficiency can be improved, and the prepared formed coke has the characteristics of high mechanical strength, high thermal stability and high reaction activity.