The invention discloses a prepayment method of medium-free high-security electricity meters. The prepayment method comprises the following steps: after purchasing electricity by a user, encoding and encrypting the recharge type, electricity purchasing times, electricity purchasing time, meter number and electricity purchasing money amount at a selling operation end to generate a digital recharge token which is remotely sent to a concentrator through a communication network and is pushed to the mobile phone of the user at the same time; sending the digital recharge token into an interactive terminal by the concentrator to decrypt and obtain the recharge type, the electricity purchasing times, the electricity purchasing time, the meter number and the electricity purchasing money amount; carrying out data and flow recombination according to the recharge type so as to be suitable for recharging different types of prepayment electricity meters. The method is compatible with state grid electricity meters and STS (Standard Transfer Specification) prepayment electricity meters, and repeated construction of prepayment systems is prevented, and the waste of manpower and material resources is reduced; as an independent part, the interactive terminal is suitable for different types of prepayment electricity meters.