An outdoor canopy includes a canopy frame, a canopy shelter and a side entrance arrangement. The canopy frame includes a roof frame and a legs frame downwardly extended from the roof frame to form a canopy area. The canopy shelter is waterproof and is detachably fastening at the canopy frame to define a ceiling wall, a front wall, a rear wall and two sidewalls for enclosing the canopy area therewithin. The side entrance arrangement is formed on one of the sidewalls of the canopy shelter to serve as an additional entrance, which includes a side entrance opening formed on the corresponding sidewall of the canopy shelter and comprises at least one entrance fabric operatively mounted on the corresponding sidewall. The roof frame further comprises an addition support arrangement cooperatively and detachably engaged with the horizontal bars for creating a three-point support to reinforce the canopy frame.