The invention relates to a hydraulic capstan turret enhancing braking force. An oil cylinder and a lower end fluted disc are connected to a turret body. An oil cylinder end cap is arranged on the top of the oil cylinder. A cutter stand is connected with an upper end fluted disc and a main shaft. An upper piston and a lower piston in the turret are fixedly connected and meanwhile connected with the main shaft through bearings. An upper piston upper cavity is formed among the oil cylinder end cap, the oil cylinder and the upper piston. An upper piston lower cavity is further formed between the oil cylinder and the upper piston. A lower piston upper cavity is formed among the turret body, the oil cylinder, the upper piston and the lower piston. A lower piston lower cavity is further formed between the turret body and the lower piston. A braking oil way of the turret is communicated with the upper piston upper cavity and the lower piston upper cavity. A loosening oil way is communicated with the upper piston lower cavity and the lower piston lower cavity. The hydraulic capstan turret is simple in structure and high in practicality, and can also effectively enhance the hydraulic braking force of the hydraulic capstan turret body.