The invention provides a method for replacing a hinge support bearing of a crane boom. The method comprises the following steps: 1, mounting a rigid support on the back side of a hinge support, and propping the end part of the boom by using the rigid support to prevent the boom from moving backward; 2, mounting a plurality of lifting lugs, meeting a load requirement, between the boom and a turnplate; 3, mounting a steel wire rope, a first hoist, a second hoist on each lifting lug, and detaching a rotating shaft of the boom; 4, regulating the first hoist and the second hoist to enable the boom to break away from the hinge support and move upwardly along the rigid support as well as expose a bearing of the boom, and repairing and replacing the bearing of the boom; 5, regulating the first hoist and the second hoist to enable the boom to move downwardly along the rigid support back to the hinge support, and mounting the rotating shaft to repair or replace the bearing of the boom. By the method, the fact that large-tonnage hoisting equipment is used for hoisting a crane boom system can be avoided, so that money, time and labor are saved.