The invention relates to an aggregation transaction electric quantity allocation method of a distributed power supply. The aggregation transaction electric quantity allocation method comprises the steps of determining type and numbers of each distributed power supply in a power supply aggregation body, and collecting basic data; determining transaction electric quantity of the power supply aggregation body by a power exchange center; determining initial transaction electric quantity allocated by each distributed power supply according to power supply output characteristic and installation capacity; determining a transaction electric quantity adjustment coefficient of each distributed power supply; calculating transaction adjustment electric quantity of each distributed power supply, and normalizing and correcting the transaction adjustment electric quantity to obtain final transaction allocation electric quantity; and performing safety verification on the final transaction allocation electric quantity, and issuing to each distributed power supply. During the distributed power supply participating in market transaction process in an aggregation body form, factors such as the installation capacity, power generation efficiency and integral line loss of a machine set are comprehensively considered, the transaction electric quantity is fairly and reasonably allocated to each distributed power supply according to a certain proportion, the positivity of each distribution power supply can be fully mobilized, and clean energy development is promoted.