A multi-functional chair, comprising a base (13), a seat bottom bracket (21) and a cushion (7). A slide rail (19) is vertically arranged at the rear portion of the base (13). The slide rail (19) is fitted with a slider (20). A post (8) is connected to the slider (20). A multi-functional backrest plate (24) is pivotally connected to the upper end of the post (8). Telescopic rods (2) are arranged at both sides of the multi-functional backrest plate (24). A first top massage protrusion (3A) is arranged on the telescopic rods (2), and a second top massage protrusion (3B) is arranged at the front side of the multi-functional backrest plate (24). A supporting rod (25) is arranged in a sector region between the multi-functional backrest plate (24) and the rear side of the post (8). A support (17) is connected to the slider (20). The support (17) has a portion extending up and down in the vertical direction and a portion extending front and back in the horizontal direction. A lifting column (16) is provided at the front of the base (13), and the seat bottom bracket (21) is connected to the upper end of the lifting column (16). The cushion (7) is provided on the upper surface of the seat bottom bracket (21). The portion extending front and back of the support (17) is connected to the seat bottom bracket (21). A lifting device is provided on the base (13), and a lifting component of the lifting device is connected to the post (8). The chair can be used for fitness exercises.Linvention concerne une chaise multi-fonctionnelle, comprenant une base (13), un support inférieur de siège (21) et un coussin (7). Un rail de coulissement (19) est disposé verticalement au niveau de la partie arrière de la base (13). Le rail de coulissement (19) est équipé dun coulisseau (20). Un montant (8) est relié au coulisseau (20). Une plaque de dossier multi-fonctionnelle (24) est reliée de façon pivotante à lextrémité supérieure du montant (8). Des tiges télescopiques (2) sont agencées au niveau d
