The present optical circulator has a variety of defects,such as,the angle errors among constituent components,its failing to eliminate the optical axis orientation errors of half-wave plate,and its complexity in installation and debugging. In order to overcome these shortcomings,we devise a dual-wave plate axis asymmetric structure which can reduce or even eliminates errors. Further,we design an error self-healing high-isolation quasi-four-port optical circulator based on the strucutre. Through theoretical analysis,Jones matrix calculation and MATLAB simulation,we find its insertion loss is minimum among existing optical circulators,and the isolation can increase 5-8 dB.