The utility model discloses a pipe supporting mechanical arm for wellhead operation. Linear drive device, the driving direction of the linear driving device is horizontal; the driving end of the linear driving device is connected with a pipe supporting gripper; a pushing piece is fixedly connected to the pipe supporting gripper. Wherein one side of the pushing piece is open, the open side of the pushing piece deviates from the direction where the pipe supporting gripper is located, the core supplementing mechanism is located in the pushing piece, the axis of the core supplementing mechanism isvertical, a semicircular notch is formed in the side, deviating from the direction where the pipe supporting gripper is located, of the core supplementing mechanism, and a centralizing permanent magnet is arranged below the core supplementing mechanism. The pipe supporting mechanical arm for wellhead operation aims to solve the problem that in the prior art, various pipe rods need to be pushed tothe position over a wellhead or the position of an oil pipe conveyor manually, and the purposes of reducing the risk of wellhead operation and improving the automation degree are achieved.