An attaching strap of an automatic twistlock coil belongs to the technical field of attaching straps, which comprises a platy pulling strap, a locking house, a clamping and stopping mechanism and a manual operation mechanism, wherein one side of the pulling strap is provided with a claw groove; the locking house is fixed on one end of the pulling strap; a pulling strap groove communicated with a cavity of the locking house and for the pulling strap penetrating through is arranged along the length direction of the locking house; the clamping and stopping mechanism is articulated with the locking house, positioned in the cavity of the locking house and matched with clamping claws in the house cavity; the manual operation mechanism is used for driving the clamping and stopping mechanism to act, connected with the clamping and stopping mechanism and positioned on a side part at one side in the length direction of the locking house. The invention has the advantages that the attaching strap can be repeatedly used so as to save resources, only needs manual operation, does not need other devices, has high attaching efficiency and can be operated by one person. In addition, the labor strength of workers can be also lightened.