A turnover apparatus for a turnover folding bed, comprising: an upright frame, support modules (2), and rotating modules (3), wherein the upright frame is a frame structure having a left side plate (1) and a right side plate; there are both two sets of support modules (2) and two sets of rotating modules (3), and each set is separately mounted on the inner side surfaces of the left side plate (1) and the right side plate; the left side plate (1) and the right side plate are identical in structure; the inner side surface of the left side plate (1) is provided with inwardly-recessed slots (11) used for mounting the support modules (2) and the rotating modules (3). By means of structural design, the turnover apparatus makes the stress of a bed board dynamically balanced, i.e., the bed board can stop at any position during a turnover process, and enables the bend board to be folded or unfolded by applying a very small force. Besides, the design enables the stress to be balanced at any point, thereby ensuring the safety in use. Furthermore, the design of auxiliary components, such as a curved guiding means (231) and a guiding rod (12), limits the motion trajectory of the turnover apparatus, thereby ensuring the working stability of the turnover apparatus.