The embodiment of the invention provides a method of designing a labyrinth type sound box. In the method of designing a labyrinth type sound box, the length of a transmission line type sound pipeline is determined through common calculation of the size parameter of a flat television and the resonant frequency of loudspeakers. The method of designing a labyrinth type sound box is applied to a flat television, and can effectively improve the low frequency response effect of the flat television so as to provide a relatively shocked audition environment for a user and improve the auditory experience of the user, while the system cost is not improved and the thickness and the volume of the flat television are not increased.