The invention relates to a monitoring cloud platform system for landslide of a tower footing of an electric transmission line tower. The monitoring cloud platform system comprises a communication system and a data processing system, wherein the communication system is used for receiving environment data of a high-voltage transmission tower collected by a tower monitoring terminal and transferring the environment data to the data processing system; the data processing system is connected with the communication system and is used for processing the environment data; the data processing system comprises a comparing unit, a storage unit and a judging unit; the comparing unit is connected with the communication system and is used for comparing the environment data acquired from the communication system at each time with historical data in the storage unit and calculating a variation value of the environment data relative to the historical data; the storage unit is connected with the comparing unit and is used for storing the historical data and storing the environment data as the historical data after the variation value is calculated by the comparing unit; and the judging unit is connected with the comparing unit and is used for judging if the variation value acquired at each time exceeds a preset variation range. The monitoring cloud platform system can be used for monitoring the change condition of the natural environment under which the high-voltage transmission tower is located.