An investment efficiency analysis method and device related to power distribution network reliability, and computer readable storage medium. The method comprises: acquiring apparatus change information of a power service area (step 1); calculating, according to a changed apparatus corresponding to the change information, an investment cost (step 2); pairing the investment cost with a pre-arranged power outage incident to obtain an association relationship (step 3); establishing, according to the change information, a prediction model for an reliability increase of a power distribution network for a reliability-related investment (step 4); establishing an investment efficiency calculation model for power distribution network reliability (step 5); and upon an apparatus change in the power service area, employing the investment efficiency calculation model for power distribution network reliability to calculate an investment efficiency for power distribution network reliability (step 6).
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