The invention discloses a damping rotating spindle which comprises a shell body with a shell body cover that is fixed at one end of the shell body; a rotary shaft which is rotatably arranged in the shell body and is provided with a flange at the bottom end of the rotary shaft, wherein the flange is matched with the shell body and divides the shell body into a first chamber and a second chamber, and a variable diameter hole is arranged in the flange and a sealing ball is arranged in the variable diameter hole; a damping grease which is filled in the first chamber and the second chamber and is used for providing a resistance; a first hole and a second hole which are arranged on the shell body and are used for communicating the first chamber and the second chamber, and the first hole and the second hole communicated with each other by a passage; a first adjustable stopping piece and a second stopping piece which are used for regulating the damping grease flow and are respectively arranged in the first hole and the second hole; and an elastic component. When the rotary shaft is rotated, the flow of the damping grease can be regulated by regulating the first adjustable stopping piece and the second adjustable stopping piece, thereby regulating the damping effect in the rotating process.