The present invention discloses a straightness measurement straightener for a rural power electric pole of the power system. The straightness measurement straightener comprises a horizontally arranged pedestal; two ends of the pedestal are respectively provided with a rear limiting device and a front limiting device; a pendulum cylinder capable of swinging back and forth is hinged inside a supporting segment of the pedestal; a supporting device is inserted into the pendulum cylinder; the supporting device is locked with a mid-upper segment of the electric pole through a locking device hinged in a manner of swinging up and down; a power input terminal of the supporting device is in transmission connection with a power device through a bendable transmission flexible pipe; the supporting seat is also fixedly provided with a handle; and the inner end of the handle is also fixedly provided with an outwardly extended protective cover. The straightness measurement straightener has the advantages that whether the electric pole is vertical can be measured rapidly, soil and stones at the positive side of the electric pole can be digged rapidly, dust disoperation can be prevented, and the electric pole can be rapidly straightened; the straightness measurement straightener is labor-saving and time-saving, small in size and convenient to carry, and can be fixed firmly; and the electric pole can be independently straightened by one person, straightening efficiency is high, and the electric pole can be prevented from being broken.