Method for continuously preparing carbon fibers from acrylic fibers

The invention relates to the technical field of preparation of carbon fibers, in particular to a method for continuously preparing carbon fibers from acrylic fibers, which comprises the following steps: continuously impregnating the acrylic fibers in a modified solution, continuously feeding the impregnated acrylic fibers into a pre-oxidation furnace, a low-temperature carbonization furnace and a high-temperature carbonization furnace, and carrying out heat treatment to obtain the carbon fibers, the modified solution is a solution containing dopamine organic matters; according to the method, the acrylic fibers are soaked in the low-concentration dopamine organic matter solution, the initial temperature of a chemical reaction in the pre-oxidation furnace can be effectively reduced, heat released by the reaction is greatly reduced, the heat released by the reaction is more gentle, and the fibers are prevented from being burnt out due to instant and rapid heat release, and the soaking time of the acrylic fibers