The invention discloses an intelligent material carrying mechanical arm and carrying method. The mechanical arm comprises a mechanical carrying hand, the mechanical carrying hand comprises a first supporting arm, a second extension arm, a mechanical palm and a four-finger grabbing device; the first supporting arm is connected with the second extension arm through a hinge shaft, the second extension arm is connected with the mechanical palm through a palm turning mechanism, and the bottom end of the mechanical palm is connected with the four-finger grabbing mechanism through a four-shaft synchronous driving mechanism. The method comprises the steps that a walking carrying trolley walks to the position nearby the material, the first supporting arm, the second extension arm, the mechanical palm and the four-finger grabbing device are matched, the material is grabbed, the trolley and the mechanical arm cooperate to convey the material to the designated position, the material is loosened, the mechanical arm returns to the grabbing point to continuously grab the material, an extension oil cylinder of the second extension arm can extend, the length of the mechanical arm is prolonged, themechanical grabbing ends can rapidly approach to the material, the material grabbing efficiency and accuracy are high, the structure is simple, the cost is low, the material is not prone to being damaged due to clamping, and the material transport is more stable and reliable.