Abstract: A method of removing carbons from a vehicle engine is applied for a carbon removal system of the vehicle engine, and the vehicle engine contains: an atomizer, an oxy-hydrogen carbon cleaning apparatus, an additive storage container, a check valve, an electric-control stop valve, and a flow adjustment valve. The atomizer is in connection with the vehicle engine, the oxy-hydrogen carbon cleaning apparatus is coupled with the atomizer, the additive storage container is joined with the check valve, the additive storage container includes a level gauge accommodated therein, the check valve is connected with the electric control stop valve, the electric control stop valve is coupled with the flow adjustment valve, and the flow adjustment valve is in connection with the atomizer. Accordingly, the additive is added into the oxy-hydrogen carbon cleaning apparatus so as to remove the carbons from the vehicle engine effectively and quickly.