The invention provides a circuit engagement and disengagement method for eliminating voltage upper limit surpassing in a Spring Festival mode and relates to a circuit engagement and disengagement method. In the premise of not reducing reliability of a power grid, how to eliminate voltage upper limit surpassing through opening circuits as less as possible becomes a concerned technical problem in power grid modulation. The method includes steps of acquiring power grid rack parameters and tides and generating a connection graph; according to the graph, generating an annular branch circuit sub graph; generating engagement and disengagement simulation analysis on the annular branch circuit sub graph and generating a candidate engagement and disengagement branch circuit set, performing treatment on the candidate engagement and disengagement branch circuit set by using N-1 anticipated faults and generating a valid anticipated fault set; constructing constraints and a target function; solving a minimal engagement and disengagement branch circuit set. According to the technical scheme provided by the invention, in the premise of ensuring the power grid reliability, an aim of eliminating voltage upper limit surpassing through opening circuits of the minimum quantity is achieved, load loss is avoided and power grid reliability is enabled to meet operation requirements.