The invention discloses a quality evaluation method and system of a game design. Facial expression images which are of players in gaming and are shot by shooting devices of game ends are acquired; theexpression images of all the shooting devices are respectively processed, expression classification processing is firstly carried out on the expression images, the expression images are input into intensity processing sub-models, which correspond to expressions into which the expression images are classified, to carry out processing to obtain intensity of the expressions into which the expressionimages are classified; and carrying out overall data analysis on all expression classifications and the intensity of the corresponding expressions, which are obtained in the previous step, to realizequality evaluation of the game design. According to the method, estimation of the expression intensity is carried out on the basis of expression recognition, categories and intensity levels of the expressions of the players are accurately known, then expression data of the players at each time point in game experiencing are used for evaluating design advantages and disadvantages of a game, optimization is carried out on the basis thereof, and a better player experience effect is achieved.