The invention discloses a reinforcement and carbon-fixation processing method of a concrete preform. The method comprises the following implementation steps: immersing the prepared concrete preform ina calcium-based alkaline solution for a period of time, then taking out the alkali-impregnated concrete preform, placing in a carbonization curing kiln, and introducing waste hot flue gas containingCO2 into the carbonization curing kiln; enabling the concrete preform to be subjected to carbonatedized curing for a period of time, and then taking out from the carbonization curing kiln to completethe reinforcement and carbon-fixation processing of the preform. The invention mainly aims at providing the reinforcement and carbon-fixation processing method of the concrete preform; the method is especially suitable for the reinforcement of inorganic silicate preforms as well as the mineralized fixation and emission reduction of the CO2 in the flue gas; the process is simple and easy to implement, has significant social, environmental protection and economic benefits, and is suitable for industrial implementation and application.