This creation relates to a stepless flapping mechanism for a skin-beautifying device. The mechanism includes at least: a power source, a reduction gear set, and a reciprocating mechanism. The reciprocating mechanism includes a central drive shaft, a reciprocating sleeve, an elastic shaft, and An outer cylinder； the central drive shaft is driven by the reduction gear set, the reciprocating sleeve is sleeved on the central drive shaft, and an upper end of the reciprocating sleeve is provided with the elastic shaft, and the reciprocating sleeve and elasticity The outer cylinder is sleeved with the outer cylinder, and an elastic element is provided between the outer cylinder and the elastic shaft. The elastic element accumulates the energy of the upward displacement of the reciprocating sleeve and pushes the reciprocating sleeve downwards to reset； When the reciprocating sleeve is driven to rotate intermittently by the central drive shaft, the reciprocating sleeve is intermittently moved upward by a distance guided by the central drive shaft or the outer cylinder, and is then pushed back and reset by the elastic element. Those who rise and fall intermittently produce the effect of reciprocating slapping.本創作關於一種美膚裝置之無段式拍打機構，該機構至少包含：一動力源、一減速齒輪組及一往復機構，該往復機構包含一中心驅動軸、一往復套筒、一彈性軸以及一外圓筒；該中心驅動軸係受該減速齒輪組驅動，該往復套筒係套接在該中心驅動軸，且該往復套筒上端部設有該彈性軸，而該往復套筒及彈性軸外係套接有該外圓筒，該外圓筒與該彈性軸間設有一彈性元件，該彈性元件係蓄積往復套筒朝上位移之能量並該往復套筒朝下回推至復位；當該往復套筒被該中心驅動軸驅動間歇旋轉，該往復套筒受該中心驅動軸或是外圓筒之導引間歇往上位移至一距離後，被該彈性元件回推復位，如此之間歇上升及下降產生往復拍打之效果者。
