The invention relates to a drop-out reset structure of a draw bar. The drop-out reset structure of a draw bar includes a support, a draw bar on the support, and an elastic reset element on the supportand the draw bar for supplying elastic force for the draw bar, wherein the draw bar is pivotally connected to the support; a draw bar force transformation structure corresponding to the elastic resetelement is arranged on the draw bar; an elastic force transformation structure corresponding to the draw bar force transformation structure is arranged on the elastic reset element; and the draw barforce transformation structure and the elastic force transformation structure can respectively form a first bearing structure and a second bearing structure through touch coordination at the droppingout moment and the resetting moment of the draw bar, and a reset force arm from the elastic reset element to the pivoted rotation center of the draw bar when the second bearing structure is formed isgreater than a drop-out force arm from the elastic reset element to the pivoted rotation center of the draw bar when the first bearing structure is formed.