Versatile foldable desk and chair combination

The utility model relates to a versatile foldable desk and chair combination which consists of four groups of chairs, wherein a backrest of each group of chair comprises two blocks of square desk plates which are connected by two hinges and have the same size, and the four groups of backrests can form a Sudoku desk top with a central plate block after the backrests are rotated for 180 degrees to a horizontal position and unfolded; and the unfolded backrests are connected with adjacent desk plates by mortises and tenons. The defect that the existing outdoor fundamental recreation and bodybuilding facilities have a single function is overcome. The product integrates the functions of recreation and body-building, is convenient and quick to operate, and has diversified functions, remarkable effect on saving occupied space and the like and outstanding social benefits.