The invention relates to a power supply safety diagnosis analysis method for a high voltage distribution network. The power supply safety diagnosis analysis method comprises the following steps: inputting a high voltage distribution network structure; determining wiring modes including a radiant wiring mode of the same power supply and different buses and a double T-type wiring mode of different power supplies; verifying whether voltage exceeding happens after supply transfer through load flow calculation; carrying out preprocessing analysis on a distribution network line, and judging the line connecting situation of the distribution network and storing the line connecting situation in a table; carrying out N-1 verification on lines, needing to be subjected to N-1 verification, in the component table according to a switch-preferential path selection method; analyzing in conjunction with an urban power supply safety standard to obtain a load power supply level; judging the supply transfer time of different lines according to average switching operation time for operation and maintenance of the power distribution network; giving measures. According to the power supply safety diagnosis analysis method for the high voltage distribution network, a quantitative analysis method can be provided for safety power supply of the high voltage distribution network, a standard is provided for estimation of the high voltage distribution network, and meanwhile, an instruction is provided for construction of the high voltage distribution network.