The invention relates to an important lifting part of a tower crane for engineering construction, belongs to the field of engineering construction, and particularly discloses a standard knot structure with a cable protector. The standard knot structure comprises a standard knot, four independent extending frames hinged to the periphery of the upper portion of the standard knot, turnbuckles used for connecting the vertically-adjacent extending frames and the cable protector; the turnbuckles are connected with the cable protector through cables, and the cable protector is connected with the ends, far away from the standard knot, of the extending frames through cables; the resultant force of pull force of the cables around the standard knot coincides with the axis of the standard knot. The standard knot adopting the structure is connected to a tower base through the extending frames and the cables, then the stress torque of the tower crane is transversely increased, the using stability of the tower crane is effectively guaranteed, and the safety coefficient of the tower crane is increased. The cable protector of the standard knot structure can lengthen an anti-snapping device to relieve the pull force borne by the cables when the pull force reaches a certain value, and then the using safety of the cables is improved.