The invention aims to make up the defects in the prior art, and provides a solving method of the maximum power supply capacity of a power distribution network by considering addition of distributed new energy based on second-order cone optimization. For the purpose, the calculation method for the maximum power supply capacity of power distribution network based on distributed new energy site selection comprises the steps of: establishing a target function of a model to correct the target function; giving constraint conditions to the corrected target function; calculating and obtaining the maximum power supply capacity of the system after the target function is changed. By employing the technical scheme, a TSC model is established, the reliability of the power distribution network is determined by employing the final model, and the power distribution network is further optimized on this basis.