Large-scale offshore hydraulic piling hammer

A large-scale offshore hydraulic piling hammer, comprising a hammer housing and a ram in the hammer housing;

• at least one hydraulic assembly capable of driving the ram to move axially along the hammer housing and disposed between the hammer housing and the ram;
• a pile sleeve connected to a bottom of the hammer housing and comprising an upper pile sleeve and a lower pile sleeve;
• and an anvil disposed in the upper pile sleeve;
• the hydraulic assembly being capable of driving the ram to strike the anvil, wherein an increased-diameter ring is disposed at a bottom of the anvil in the upper pile sleeve, a first mounting groove for mounting the anvil is formed at a top of the increased-diameter ring, a first mounting cavity is formed between an inner cavity of the increased-diameter ring and the anvil, a second mounting cavity is formed between a bottom surface of the increased-diameter ring and an inner wall of the lower pile sleeve, and the second mounting cavity has a diameter greater than a diameter of the first mounting cavity.