The invention belongs to the technical field of electric power marketing, and relates to a prepayment electric meter electricity purchasing system and method based on the electric energy meter fee control technology. The method includes the steps that webservice interfaces having data interaction with a marketing system and an automatic metering system are arranged on the electricity purchasing system; an electricity purchasing card is read and written by the electricity purchasing system through a card reader; an electric energy meter is used for recognizing the information of the electricity purchasing card, and recharging is performed. The special executing process includes the steps that according to the electricity purchasing mode selected by an electricity customer, the electricity purchasing system calls the marketing system to acquire the fee paying information of the user after the marketing system charges the electricity customer, and a business person handles electricity purchasing business for the electricity customer through the electricity purchasing system. The prepayment electric meter electricity purchasing system and method based on the electric energy meter fee control technology has the advantages that it is avoided that different electricity sealing clients are installed, and a browser is used for performing business operation in a unified mode; transmitted data are encrypted, and data safety is guaranteed; the independent interfaces are used, and the flexibility and the adaptability of the electricity purchasing system are improved; based on interface service, remote business operation is achieved, and electricity pre-selling business is expanded.