The invention relates to a safety protection device for a bridge pier. The safety protection device comprises a steel boxed cofferdam arranged at the periphery of the bridge pier and a hydraulic station fixed opposite to the steel boxed cofferdam. The steel boxed cofferdam is provided with a plurality of supporting hydraulic cylinders at least on the side close to a channel, wherein the cylinder body of each supporting hydraulic cylinder is fixed opposite to the steel boxed cofferdam; the head of a piston rod of each supporting hydraulic cylinder is exposed from the outer surface of the steelboxed cofferdam; a rodless cavity of each supporting hydraulic cylinder is communicated with the hydraulic station through a hydraulic pipeline; and the rodless cavities, the hydraulic pipelines and the hydraulic stations of all the supporting hydraulic cylinders are filled with a hydraulic medium so as to form a sealed hydraulic system. Compared with the prior art, the impact resistance of the bridge pier is greatly enhanced through the device of the invention; and the kinetic energy of an offending ship can be absorbed and converted into hydraulic energy for storage, so that the offending ship is quickly speeded down to reduce the kinetic energy, and the resultant force borne by the bridge pier tends to zero to protect the bridge pier.