A saw blade guard quick release structure and a method for locking and unlocking saw blade guard includes a locating member, a connection member, and a retaining unit. The locating member has two retaining notches. The connection member includes a first guide portion and a second guide portion. The retaining unit is installed on the connection member, including a linking member, a drag member movable along the first guide portion, two retaining members respectively pivotally connected to the drag member and movable along the second guide portion, and a spring member. The method includes mounting the connection member directly on the locating member and selectively engaging the retaining members with the locating notches, thereby locking or unlocking the saw blade guard.