A stable connecting structure for a drawer and a slide rail of a piece of furniture comprises a furniture cabinet body, a slide rail assembly and a furniture drawer, wherein the upper portion of the side plate of the furniture drawer is provided with a cavity, the lower portion of the side plate of the furniture drawer is provided with an assembly groove, a front connecting device is arranged on the cavity, a connecting portion is arranged on the front connecting device, the inner top face of the assembly groove extends to form a supporting portion, a movable slide rail of the slide rail assembly is arranged on the side plate, the rear end of the movable slide rail is connected to the rear end of the side plate through a buckling-hooking portion in a clamped mode when the movable slide rail and the side plate are assembled, the front end of the movable slide rail is clamped to the connecting portion of the front connecting device through a connecting-matching portion in a clamped mode, and when the side plate is stressed with respect to the movable slide rail at least in the upper direction and the lower direction, the connecting portion and the supporting play a mutual supporting role to enhance the connecting stability between the side plate and the movable slide rail. By the adoption of structural improvement, the stable connecting structure for the drawer and the slide rail of the furniture has the advantages that the stable connecting structure is simple, reasonable, excellent in performance, safe, reliable, low in manufacturing cost, convenient and fast to assemble, the members are compact, stable and firm in connection, the service life is long, the appearance is attractive and the like, and is good in practicability.