A power clutch mechanism of a scooter is formed of a power unit, an elastic member, a connection rod set, and an urging member. The power unit comprises a suspension seat pivoted with a footboard of the scooter, and a motor mounted on the suspension seat and provided with an output shaft on which a drive wheel is mounted in such a manner that the drive wheel is detachably engaged with a rear wheel of the scooter. The elastic member connects the suspension seat and a rear fork of the scooter. The connection rod set is formed of a first rod member and a second rod member pivoted with the first rod member by a pivot such that the second rod member and the first rod member form therebetween an angle, and that the first rod member is pivoted with the rear fork, and further that the second rod member is pivoted with the suspension seat. The urging member has a first end pivoted with the rear fork, and a second end removably urging the pivot of the connection rod set, thereby causing the drive wheel to be disengaged with the rear wheel of the scooter. When the pivot of the connection rod set is not urged by the urging member, the drive wheel is engaged with the rear wheel of the scooter.