The invention relates to a bonding part assembly for a double-folding type inside-held net-clamping box. The bonding part assembly comprises a framework cross bar, a first folding mechanism and a second folding mechanism, and the first folding mechanism and the second folding mechanism are sequentially arranged along the framework cross bar. The first folding mechanism is provided with a first elastic piece used for first folding of the net-clamping box, and the second folding mechanism is provided with a second elastic piece used for second folding of the net-clamping box. The second folding mechanism further comprises a steering wheel used for steering the net-clamping box during second folding and a blowing nozzle used for allowing a first folding position of the net-clamping box to be kept in a folding state. By the bonding part assembly, production loss is lowered while one-step production and twice folding of the net-clamping box are realized, and possibilities of abrasion marks and inclination of the net-clamping box are avoided.