The utility model belongs to the technical field of electric power systems, and particularly relates to a single-phase prepayment watt hour meter. A multifunctional single-phase prepayment watt hour meter comprises a single-phase prepayment watt hour meter and a circuit breaker. A live wire inlet end and a neutral wire inlet and outlet end of the single-phase prepayment watt hour meter are correspondingly connected with a live wire outlet end and a neutral wire outlet end of the circuit breaker by wires. A live wire inlet end and a neutral wire inlet end of the circuit breaker are connected with a power supply. The multifunctional single-phase prepayment watt hour meter is characterized in that a shunt release is fixed to the circuit breaker, a shifting rod of the shunt release is inserted into a switch shifting socket of the circuit breaker, a tripping signal input end of the shunt release is connected with a tripping signal output end of the single-phase prepayment watt hour meter through a wire, and a live wire inlet end and a neutral wire inlet end of the shunt release are correspondingly connected with a live wire outlet end and the neutral wire inlet and outlet end of the single-phase prepayment watt hour meter. The multifunctional single-phase prepayment watt hour meter has the functions of remote power supply control and remote power cutting control, in addition to the functions of the original single-phase prepayment watt hour meter.