The invention provides a relay protection logic visual calculus diagram generation method and system. The generation method comprises the following steps: acquiring the logic expression of corresponding operation; eliminating the effect of parentheses in the logic expression on the logic operation priority; decomposing the logic expression into sub-expressions, wherein the sub-expressions are logic expressions or logic operators; storing the sub-expressions in the corresponding linked list nodes in turn so as to form a logic expression linked list; obtaining the corresponding graph element nodes according to the logic operators stored in each node of the logic expression linked list so as to obtain the graph element control linked list; and generating the calculus diagram according to thegraph element control linked list. According to the technical scheme, when the logic expression is converted into the visual logic calculus diagram, the influence of the parentheses on the logic operation priority in the logic expression is firstly eliminated, and the problem of low working efficiency caused by the cumbersome analysis process of the logic expression in case of generating the relayprotection logic visual calculus diagram in the prior art is solved.