The invention discloses a device for assisting a sleeve aligning shaft. The device comprises a first transparent plate and a second transparent plate, wherein a plurality of concentric circular rings and a plurality of auxiliary lines are arranged on each of the first transparent plate and the second transparent plate; the concentric circular rings on the first transparent plate are completely superposed with the concentric circular rings on the second transparent plate; the auxiliary lines on the first transparent plate are completely superposed with the auxiliary lines on the second transparent plate; the circle center of the first transparent plate is superposed with that of a datum sleeve; the circle center of the second transparent plate is superposed with that of a pre-embedded sleeve; the second transparent plate is equipped with a fixing device for locking and fixing the pre-embedded sleeve and the second transparent plate; a central shaft of the datum sleeve and a central shaft of the pre-embedded sleeve are regulated to be completely superposed through a plumb line projected by an infrared horizontal instrument. The invention further discloses a construction process for the device for assisting the sleeve aligning shaft. The device for assisting the sleeve aligning shaft provided by the invention improves positioning accuracy of the pre-embedded sleeve.