The invention discloses an elevator control method and system based on a two-dimensional code. The elevator control method based on the two-dimensional code comprises the following steps in a first controller in a lift car that an authorized two-dimensional code is received, the control authority of an elevator is obtained, and the authorized two-dimensional code is generated by an administrator account of a two-dimensional code application program; and a user elevator taking two-dimensional code is received, the elevator operation is controlled according to the user elevator taking two-dimensional code, and the user elevator taking two-dimensional code is generated by a user account of the two-dimensional code application program. According to the provided elevator control method based onthe two-dimensional code, the management efficiency of the elevator use authority is improved, the time cost is saved for uses and visitors, and the confidentiality of user information is strengthened at the same time.