Support bracket

A support bracket adapted to an electronic device is provided. The support bracket includes a casing and at least one connecting rod. The casing is detachably mounted on a front end of the electronic device. At least one connecting rod is pivotally connected to the casing to switch the support bracket between a first state, a second state, a third state and a fourth state. When the support bracket is in the first state, a bottom surface of the casing is parallel to a virtual plane. When the support bracket is in the second state, there is a first angle between the bottom surface of the casing and the virtual plane. When the support bracket is in the third state, there is a second angle between the bottom surface of the casing and the virtual plane. When the support bracket is in the fourth state, there is a third angle between the bottom surface of the housing and the virtual plane. The first angle is smaller than the second angle, and the second angle is smaller than the third angle.