The invention discloses an engine valve electric-upsetting hot-forging forming flexible manufacturing line comprising a plurality of engine valve electric-upsetting hot-forging forming manufacture units and a plurality of conveyor belts, wherein each engine valve electric-upsetting hot-forging forming manufacture unit comprises three electric upsetting machines, a robot, a forging press, a mechanical arm and a control cabinet; the three electric upsetting machines are distributed at one side of the robot in sector arrangement; the mechanical arm is positioned at the other side of the robot and is arranged opposite to the electric upsetting machines; the forging press is positioned between the robot and the mechanical arm; and the conveyor belts are arranged between the forging press and the mechanical arm, one ends of the conveyor belts are connected with a heat treatment device, and each conveyor belt is connected with at least one engine valve electric-upsetting hot-forging forming manufacture unit. The engine valve electric-upsetting hot-forging forming flexible manufacturing line realizes the engine valve electric-upsetting hot-forging forming production automation through therobot, the mechanical arm and the conveyor belts and has the advantages of simple realization, modularization and easy maintenance.