Method for erecting main cable of cable crane

The invention relates to a cable crane, in particular to a method for erecting a main cable of the cable crane. The method comprises the following steps: a through-the-sky lead is mounted; a cable releasing device assembly is arranged on the side away from a first tower, and the main cable is connected with the through-the-sky lead; a second winch carries out cable winding action, and a first connecting point crosses the top of the first tower and crosses the top of a second tower until the first connecting point moves to the position between a second ground anchor and the second tower; one end of the main cable is connected with a second ground anchor in an anchoring manner; and the cable releasing device assembly conducts cable winding action, and after the sag of the part, located at the midspan position, of the main cable reaches the designated height, the main cable and a first ground anchor are connected in an anchoring manner, so that installation of the main cable can be completed. According to the me