The invention provides a clustered building coordination capacity allocation method based on load energy efficiency evaluation, which comprises the steps of: (1), determining building parameters including building number participating in coordination control, building industry types, demand response execution capacity thereof and a regional total cut-down capacity; (2) establishing a comprehensive index system for building energy efficiency evaluation, including a building level energy efficiency system and an equipment level energy efficiency system; (3) collecting historical electricity utilization data of buildings, and carrying out building energy efficiency evaluation on electricity utilization conditions of the buildings at the last month through a fuzzy comprehensive evaluation method to obtain final energy efficiency grading results of the buildings; (4) and calculating final cut-down capacities of the buildings by adopting an allocation principle algorithm according to parameters such as energy efficiency grades, industry coefficients and demand response execution capacity of the buildings to obtain a coordination allocation scheme. The clustered building coordination capacity allocation method achieves the purposes of completing capacity cut down and scientific allocation and promoting energy efficiency enhancement of the clustered buildings.