A state enumeration reliability evaluation method based on an influence increment and a device therefor. The method comprises: testing the accessibility of all the elements in an independent adjacent matrix corresponding to a selected power system state using a breadth-first search method; if an inaccessible element exists, an influence increment of the selected state being zero, and reselecting the power system state; if the inaccessible element does not exist, evaluating the influence of the power system state under all the load levels by means of an optimal power flow algorithm to acquire influence expectations of the power system state under various load levels, so as to acquire the influence increment of the power system state; and when all the power system states in a state set have been analysed and have reached the maximum fault search order, acquiring a reliability index of a power system by means of the influence increment. The device comprises: a test module (1), a first acquisition module (2) and a second acquisition module (3), and the computation of the reliability index is realized by means of these modules. According to the method and device, the computational accuracy and the computational efficiency are improved, and the computational complexity is reduced.
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