The invention provides a power consumption control system based on a mobile phone APP (Application), and a method thereof. The system comprises at least one ammeter, a cloud platform and a mobile terminal, and further comprises a master controller, a storage module, a data acquisition module, a data processing module, an execution module and a mobile terminal; the data acquisition module is connected with the ammeter; the data processing module is connected with the data acquisition module; the storage module is connected with the data processing module and the data acquisition module; the data processing module is connected with the execution module; the storage module, the data processing module, the execution module, the data acquisition module are connected with the master controller; the cloud platform is connected with the master controller and the mobile terminal. The master controller is used as a platform for receiving data, and sends the data to the mobile terminal; a user-defined input module and a query module are arranged on the mobile terminal, so as to limit the electrical load of each user side and monitor the power consumption of each user side and the trip log at the real time; one user has only one wire; the electric wire is prevented from being drawn privately. The system is high in security, and realizes mobile management by using the mobile phone APP.