The invention provides a power transaction electricity purchase management platform system and a meter data collecting method. The power transaction electricity purchase management platform system includes an electricity purchase management platform, a new platform settlement system and a data collection and transmission system. The electricity purchase management platform includes a service application module, a data verification module and a data collection module. The service application module includes a metering point management unit, a power plant unit management unit, a settlement formula management unit, an on-grid electricity volume metering unit, a power plant electricity volume verification unit and an electricity volume distribution unit. The data verification module includes an electricity volume data checking unit. The data collection module includes a tracking power plant collecting unit, a new energy power plant collecting unit, a local power plant collecting unit and acontact line collecting unit. The new platform settlement system includes an electricity volume settlement module. The new platform settlement system and the electricity purchase management platformare in mutual communication. The system realizes overcall covering, overcall collection and automatic remote transmission of data. The usability is improve while improvement of the enterprise management capability is promoted.