The invention discloses a roller washing machine stainless steel inner barrel spin-riveting closing former which comprises a frame. A worktable, a turntable and a first driving mechanism are arranged on the frame, the first driving mechanism drives the turntable to rotate, a spin-riveting closing mechanism is arranged on an optional side of the turntable and comprises a spin-riveting support, spin-riveting heads are respectively arranged on the spin-riveting support along the axial direction of the turntable, each spin-riveting head comprises two forming press plates for rotatably pressing the wall of a stainless steel inner barrel on connecting bosses of plastic components from a barrel body to two barrel openings respectively, ends of the two forming press plates are close to each other to form spin-riveting ends, a spin-riveting forming area for containing the connecting bosses of the plastic components in spin-riveting is formed in the spin-riveting ends, and pneumatic regulation mechanisms are arranged on the spin-riveting heads and used for adjusting radial movement of the forming press plates along the connecting bosses and completely crimping and coating the wall of the barrel on the connecting bosses. Acting force on the stainless steel inner barrel can be balanced by the pneumatic regulation mechanisms of the spin-riveting heads, and stable forming quality of a closing structure is ensured.