The invention belongs to the technical field of aluminum product bending, and particularly discloses a bending mechanism of an aluminum strip bending machine. The bending mechanism comprises a machine frame, a supporting block, a displacement sensor, a controller, a bending block, a first servo motor, a supporting rod, a pressing rod and a second servo motor. The supporting block is fixed to the machine frame. The displacement sensor is located on the side face of the supporting block. The bending block is shaped like the Arabic number seven. The bending block is fixed to an output shaft of the first servo motor. One end of the supporting rod is fixed to an output shaft of the second servo motor. The pressing rod is fixed to the other end of the supporting rod. The displacement sensor, the first servo motor and the second servo motor are all electrically connected with the controller. The servo motors can accurately control the rotation angle, are used in cooperation with the controller, and can be operated according to a set program, errors are small, and the automation degree is high.