The invention discloses a system for collecting the maximum demand of multi-power-source power supply direct power purchase customers. The system comprises a metering device, a station collecting device and a main station system. The precision of electric meters of the metering device is 0.2S. The electric meters can store electrical degree load curve in at least one month according to the density of one minute and can provide data outwards through an RS485 channel, and the electric meters are installed at metering points between larger users and a power grid. The system for collecting the maximum demand of the multi-power-source power supply direct power purchase customers is high in operability, easy to operate and maintain and good in reliability.