The invention relates to a large-sized orthogonal multi-screen display apparatus. The large-sized orthogonal multi-screen display apparatus is characterized in that a projection screen system is formed by orthogonally arranging a front projection screen, a rear projection screen, a left projection screen, a right projection screen and a top projection screen or a front projection screen, a rear projection screen, a left projection screen, a right projection screen, a bottom projection screen and a top projection screen, and a cubic space is formed; each projection screen corresponds to a projecting set; each projecting set is composed of n projectors, n is an integer greater than or equal to 2; the projecting sets form a projector system. A plane screen is adopted and is finer and more vivid than a cylindrical screen, a ring screen and a spherical screen; the orthogonal screens can be flexibly combined for use as required; the large-sized orthogonal multi-screen display apparatus is more suitable for displaying large-sized scientific and technological achievements, natural scenery, industrial products and movie special effects in science and technology museums, other museums, fairs and theme parks; with the cubic structure, the large-sized orthogonal multi-screen display apparatus allows simpler constructional structure of a stadium and lower construction cost.