The invention discloses an electric arc welding process for a 16Mn steel plate and relates to the technical field of welding processes. The electric arc welding process mainly involves the four steps of preparation before welding, tack weld, welding and post-weld treatment. According to the electric arc welding process for the 16Mn steel plate, the welding steps are simplified, the welding mode is simple, material selection is accurate and standard, the welding quality of the 16Mn steel plate can be guaranteed, a standard welding mode is provided for the 16Mn steel plate, and fast and secure welding of the 16Mn steel plate is facilitated.