A game machine with a controllable an opening angle is characterized in that: including: a main body, having two lateral plates, an accommodation space and a mounting rod, wherein a front end of the accommodation space has a front opening; a movable gate, disposed at the front opening, wherein a rear end of the movable gate has a pivotal part pivoted to top end of the main body; and a movable mounting rack, having one end thereof disposed at a rear end of the movable gate and having two lateral mounting plates and at least one connection rod between the two lateral mounting plates, the lateral mounting plates are disposed at two sides of the movable mounting rack, the lateral mounting plates correspondingly have at least two mounting slots allowing the mounting rod to be mounted; a retractable rod is disposed between the moveable gate and the main body.