A bed with overturn function is disclosed. The bed includes a pulley set, a driving lever and a four bar linkage structure. The pulley set includes a first pulley and a second pulley. The first pulley connects with the second pulley through a belt. The second pulley rotates according to the first pulley. The driving lever is through the first pulley. When the driving lever rotates in a first direction, the first pulley rotates with a first direction. The four bar linkage structure includes an input link. The input link connects with the driving lever through the pulley set. The four bar linkage structure rotates according to the driving lever. Wherein, the four bar linkage structure rises from a first position to a second position when the input link rotates to a first angle.本發明提供一種可提供翻身功能之病床,病床包含:一皮帶輪組,具有一第一皮帶輪與一第二皮帶輪,且第一皮帶輪透過一皮帶與第二皮帶輪連結,且第二皮帶輪依據第一皮帶輪旋轉;一驅動桿,穿越第一皮帶輪,當驅動桿沿一第一方向旋轉時,第一皮帶輪沿第一方向旋轉;以及一四連桿結構,具有一輸入桿,輸入桿透過皮帶輪組與驅動桿連結,且四連桿結構依據驅動桿件進行旋轉;其中,當輸入桿旋轉至一第一角度時,四連桿結構由一第一位置上升至一第二位置。100‧‧‧病床101‧‧‧皮帶輪組101a‧‧‧第一皮帶輪101b‧‧‧第二皮帶輪B‧‧‧皮帶102‧‧‧驅動桿103‧‧‧四連桿結構103a‧‧‧輸入桿L‧‧‧中心軸G1、G2‧‧‧側邊
