The invention discloses a locating and sizing method for connecting electric heat storage type heating equipment into a power distribution network, which comprises the following steps: carrying out load flow analysis and calculation on the power distribution network in a region to be planned to obtain a voltage value of each access point, selecting accessible points meeting a voltage deviation requirement, and carrying out load portraying and feeder portraying on the selected accessible points; taking minimization of the sum of the investment cost and the operation cost of the electric heat accumulation type heating equipment as a target function, and constructing an optimal configuration model of the electric heat accumulation type heating equipment; optimizing the constructed optimal configuration model of the electric heat storage type heating equipment by adopting a random particle swarm algorithm to obtain the access capacity of each access point; and carrying out electric energyquality evaluation on each access point by utilizing the data envelope line, and if the evaluation does not meet the requirements, giving a correction scheme. According to the locating and sizing method for connecting the electric heat storage type heating equipment into the power distribution network, the optimal layout of the electric heat storage type heating equipment can be realized.