The invention relates to the technical field of interlocking seam sewing machines, in particular to a multi-stitch flat type interlocking seam sewing machine which comprises a sewing machine body, a workbench, supporting legs, guiding mechanisms, a protective shell and a controller, wherein the workbench is located on the supporting legs and fixedly connected with the supporting legs, the sewing machine body is fixedly connected to the upper end of the workbench, and arc chamfers are arranged on two opposite edges of the workbench; the guiding mechanisms are located on two sides of the workbench, and each guiding mechanism comprises a fixing plate, a driving roller, a driven roller and a motor; and each fixing plate is fixedly connected to the corresponding side of the workbench. The guide mechanisms drive fabric to move on the workbench and is matched with the sewing machine body to sew the fabric, so that the guide mechanism can move away the sewed fabric, the smoothness of the fabric on the workbench is guaranteed, the situation of sewing interruption caused by fabric wrinkles is prevented, and therefore, the stability and the quality of the multi-stitch flat type interlocking seam sewing machine for sewing and weaving the fabric are improved.