A connecting rod folding mechanism for a baby cot, comprising: an upper surrounding joint connecting rod folding mechanism, comprising a joint base, and an upper surrounding tube is connected at circular holes on both sides of the joint base; an corner connecting rod folding mechanism, comprising a corner base, an upper connecting rod and a lower connecting rod; the lower connecting rod is connected with the corner base through a first pivot; the upper surrounding tube is connected with the corner base through a second pivot; the corner base is fixed to a vertical column; one end of the upper connecting rod is connected with the upper surrounding tube; the other end of the upper connecting rod is movably connected with one end of the lower connecting rod; and the other end of the lower connecting rod is connected with a pulling mechanism; and a base connecting rod folding mechanism, connected with the vertical column and the pulling mechanism; wherein the upper surrounding joint connecting rod folding mechanism further comprises a pulling cord; the corner connecting rod folding mechanism further comprises a pull-cord rod; the lower connecting rod penetrates through the pull-cord rod; one end of the pull-cord rod is connected with the corner base through a third pivot; the other end of the pull-cord rod is connected with one end of the pulling cord; and the other end of the pulling cord is connected to the upper surrounding joint connecting rod folding mechanism; characterized in that: a joint pin is arranged on one end, connected with the joint base, of the upper surrounding tube; the joint pin is arranged in the upper surrounding tube; a compression spring is arranged in the joint pin; and the other end of the pulling cord is connected to the joint pin in the upper surrounding joint connecting rod folding mechanism. an upper surrounding joint connecting rod folding mechanism, comprising a joint base, and an upper surrounding tube is connected at circular holes on both sides of the joint base; an corner connecting rod folding mechanism, comprising a corner base, an upper connecting rod and a lower connecting rod; the lower connecting rod is connected with the corner base through a first pivot; the upper surrounding tube is connected with the corner base through a second pivot; the corner base is fixed to a vertical column; one end of the upper connecting rod is connected with the upper surrounding tube; the other end of the upper connecting rod is movably connected with one end of the lower connecting rod; and the other end of the lower connecting rod is connected with a pulling mechanism; and a base connecting rod folding mechanism, connected with the vertical column and the pulling mechanism; wherein the upper surrounding joint connecting rod folding mechanism further comprises a pulling cord; the corner connecting rod folding mechanism further comprises a pull-cord rod; the lower connecting rod penetrates through the pull-cord rod; one end of the pull-cord rod is connected with the corner base through a third pivot; the other end of the pull-cord rod is connected with one end of the pulling cord; and the other end of the pulling cord is connected to the upper surrounding joint connecting rod folding mechanism; characterized in that: a joint pin is arranged on one end, connected with the joint base, of the upper surrounding tube; the joint pin is arranged in the upper surrounding tube; a compression spring is arranged in the joint pin; and the other end of the pulling cord is connected to the joint pin in the upper surrounding joint connecting rod folding mechanism. a joint pin is arranged on one end, connected with the joint base, of the upper surrounding tube; the joint pin is arranged in the upper surrounding tube; a compression spring is arranged in the joint pin; and the other end of the pulling cord is connected to the joint pin in the upper surrounding joint connecting rod folding mechanism.