The utility model relates to a dead center-controllable free piston internal combustion linear generator and belongs to the field of energy power. The dead center-controllable free piston internal combustion linear generator mainly comprises a free piston internal combustion engine, linear generators, a disc control mechanism and a connecting rod, wherein the connecting relationship of the components is that the free piston internal combustion engine and the linear generators are sequentially connected to form free piston internal combustion linear generators; two free piston linear generators are symmetrically arranged on a straight line passing through the circle center of a disc; and the disc is connected with a motor through a shaft. A motion through line is preformed in the disc and is matched with a curve of a motion cycle of a piston in shape. The internal through line of the disc is in contact connection with the free piston internal generator connecting rod to play roles of returning the free piston and controlling an upper dead center. According to the dead center-controllable free piston internal combustion linear generator disclosed by the utility model, the disc control device is applied, and thus the aim of controlling the dead center of the piston is achieved. When the disc works, high balance and favorable stability are obtained; and multi-cylinder synchronous operation can be realized.