The present invention relates to a waffle slab optimal design device and optimal design method capable of optimizing the cost and carbon dioxide emission required for a waffle slab, which is a type of long-span structure used in a large building, A waffle slab optimal design device according to an embodiment of the present invention, a candidate value database in which design variables, candidate values, and candidate value indexes of the waffle slab used in the building are stored; Until a preset termination condition is satisfied, at least one of gene selection, crossover, mutation, and substitution operation is performed on the gene bitstreams generated by combining the candidate value indices of the design variables for each generation. a genetic algorithm processing unit for generating , and deriving a plurality of gene bit strings that satisfy the termination condition; Violation that determines whether or not all of the constraints according to the preset load requirements and design criteria are satisfied for each generation of gene bit strings, and calculates the violation rate if at least one of the constraints is not satisfied rate calculator; First calculated values of the first objective function for calculating the CO 2 emission for each generation of gene bit strings, second calculated values of the second objective function for calculating the required cost, and the calculation of the violation rate a fitness calculator configured to calculate fitness values by using the violation rate values calculated in the section; and deriving waffle slab design proposals corresponding to a plurality of predetermined gene bit strings in the order of the greatest fitness value among the plurality of gene bit strings satisfying the termination condition, and preset optimization for the derived plurality of waffle slab design proposals and an optimal solution determining unit that determines an optimal waffle slab design plan using the ratio.
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