The invention discloses a replacing method of a crane steel wire rope. The replacing method comprises the following steps of preparing a new steel wire rope, splitting a rope end, which is 1 m long, of an old steel wire rope into n strands, intercepting a strand a and retaining a strand b, splitting a rope end, which is 1 m long, at a rope end of the new steel wire rope into n strands, and intercepting a strand b and retaining a strand a; bonding the strand b of the old steel wire rope and the strand a of the new steel wire rope; lifting a winding drum; when the connection part between the newsteel wire rope and the old steel wire rope completely leaves the winding drum, cutting off at the strand splitting position of the new steel wire rope, and pressing and fixing a first rope end on the winding drum by a first pressing plate; continuously lifting the winding drum until the number of winding turns of the steel wire rope on the winding drum is X; releasing a section of steel wire rope from a new steel wire rope coil, and cutting off to form a second rope end; enabling the winding drum to drop until the whole steel wire rope on the winding drum falls; pressing and fixing the second rope end on the winding drum by a second pressing plate; and hoisting the winding drum until the number of the winding turns of the steel wire rope is X. The replacing method has the advantages thatwelding is not needed, and the safety factor is higher.