The invention relates to a method for evaluating the reliability of information transmission of an active power distribution network by considering secondary equipment influence, and belongs to the technical field of the reliability evaluation of a power distribution network. The invention provides an analysis and calculation method for evaluating the reliability of the active power distribution network by considering the secondary equipment influence. The method comprises the following steps of acquiring a fault rate and a repair rate of a terminal acquisition device, an information transmission system and a control main station on the basis of the engineering practice of the active power distribution network, and obtaining the correct transmission probability of the information in the active power distribution network between the terminal acquisition device and the control main station; establishing an area connection matrix and a fault judging matrix, and classifying load points on the basis of the area connection matrix and the fault judging matrix; and finally evaluating the influence of a primary equipment fault in each area on the reliability of each load point, thereby obtaining the fault rate of the load point as well as the reliability index of annual power failure time. The calculation process is clear in physical concept, and the influence of secondary equipment on the reliability of the active power distribution network can be effectively and quantitatively evaluated.