The invention discloses a hanging-rail sliding door. The hanging-rail sliding door comprises a hanging rail, a sliding door, a hanging wheel mechanism, fixing pieces and a clamping sleeve. The hanging wheel mechanism slides in the length direction of the hanging rail, the clamping sleeve is detachably installed on the hanging wheel mechanism, the fixing pieces penetrate through the clamping sleeve and the sliding door respectively to allow the sliding door to be detachably fixed on the clamping sleeve. According to the hanging-rail sliding door, the pressure borne by the unit area of a rail is reduced in the mode that the width of the rail and the number of a rolling wheel are added is reduced, and therefore the safety and the durability of the hanging-rail sliding door are improved.