The invention discloses an active marine hydraulic station dynamic vibration absorption device which at least comprises a mass block, a cylinder barrel, a piston rod, a pressure sensor, an exhaust valve, an air inlet valve, an air compressor, an acceleration sensor and an ECU. The mass block is fixed to the cylinder barrel, the cylinder barrel is installed in cooperation with the piston rod, and the piston rod is fixed to a hydraulic station base. The piston rod is of a hollow cavity structure, and an oil cavity and a gas cavity are arranged in a cavity of the piston rod, wherein the oil cavity is formed at the upper portion, the gas cavity is formed at the lower portion, and the gas cavity and the oil cavity are separated through a diaphragm. The exhaust valve and the air inlet valve are installed at the lower portion of the piston rod and communicate with the gas cavity, and the air compressor is connected with the gas cavity of the piston rod through the air inlet valve. The pressure sensor is arranged on the side wall of the gas cavity of the lower portion of the piston rod. The acceleration sensor and the ECU are arranged on the hydraulic station base. The pressure sensor, the air inlet valve, the exhaust valve, the air compressor and the acceleration sensor are connected with the ECU. By means of the dynamic vibration absorption device, the frequency can be actively adjusted, energy of vibration of the hydraulic station is effectively absorbed, and the stable running of the dynamic vibration absorption device is ensured.