The invention provides a covered stent, a covered stent system and a use method thereof. The covered stent is designed by comprising a main body, at least a first collateral branch which is embedded in the main body and is tangent with the inner wall of the main body, at least a second collateral branch which is arranged on the outer side of the main body is integrated with the main body, and at least a third collateral branch which is detachable. The covered stent has the following beneficial effects: 1) the design that the second collateral branch is integrated with the main body and on end of the third collateral branch is inserted into the first collateral branch reduces risks of internal leakage; 2) after a first part is sent into a vascular diseased region, firstly, the second collateral branch on which a branch sheath is sleeved is pulled into a first branch vessel of the vascular diseased region, and then the main body is released, at the time, the second collateral branch plays a role of positioning, so as to reduce risks of movement of the covered stent; 3) since the third collateral branch is detachable, the main body and the third collateral branch can be respectively made according to requirements, and a problem of difficult stock-up is solved.