The invention discloses a baking-free brick and a production method thereof. The production method comprises the following steps: adding a coagulant and a coagulant aid into pipe network sludge, stirring the obtained mixture to concentrate the mixture, and dewatering and air-drying the obtained concentrate to obtain dewatered sludge with the water content of 25-35 wt%; removing impurities from construction wastes through a sorting process, and then crushing and screening the impurity-removed construction wastes to obtain recycled fine aggregates with the particle size of 0-4.75 mm; mixing 25-40 wt% of the dewatered sludge, 30-45 wt% of the recycled fine aggregates, 5-15 wt% of blast furnace slag, 5-15 wt% of steel slag and 9-13 wt% of a cementing material, adding water, and performing stirring to obtain a slurry; pouring the slurry into a mold, and performing compression molding; and demolding the formed slurry, and performing curing for at least 28 days to obtain the baking-free brick. The baking-free brick and the preparation method thereof aim at solving the technical problem of insufficient utilization of industrial wastes or municipal waste by baking-free bricks in the prior art.