[Objective] To introduce the surgical technique and preliminary clinical results of reconstruction of coracoclavicular ligament with coracoid tunnel-free under arthroscope. [Methods] From april 2020 to September 2021, a total of 18 patients with acromioclavicular joint dislocation（Rockwood Ⅲ-V）were treated with arthroscopic reconstruction of coracoclavicular ligament with coracoid tunnel-free technique. Fistly，a double clavicular tunnel was established at the position where the lateral clavicle accounted for 16% and 25% of its total length, The high-strength wire of tightrope steel plate is used to bypass the bottom of coracoid and pass through the clavicular double tunnel by lead wire.The button plate is placed in the inner tunnel and the adjustable plate is placed in the outer tunnel.Then tighten the high-strength wire to make the steel plate closely fit with the clavicle, gradually reseted the acromioclavicular joint.Finally, tied and fixed again. [Results] All patients had surgical procedures performed successfully without serious complications, and were followed up for 5-22 months. The ASES, VAS and Constant scores significantly improved at the latest follow up compared with those before operation (P<0.05). [Conclusion] Arthroscopic reconstruction of coracoclavicular ligament with coracoid tunnel-free technique could achieve satisfactory clinical outcomes for acromioclavicular joint dislocation.