The invention provides an edge-covering sewing machine using automatic induction to cut off edge-covering strips and bottom-surface threads, belongs to the technical field of sewing equipment manufacturing, and solves the technical problems that an existing edge-covering sewing machine is single in function, low in automation level and the like. The edge-covering sewing machine comprises a shell,a spindle and a needle rod which can vertically move in a reciprocating manner and is characterized in that the spindle is connected with a separation and combination support through a connecting rodand can drive the separation and combination support to move vertically in a reciprocating manner; a cutter seat and a lifting seat which can move vertically are arranged on the shell, a cutter is fixedly connected to the cutter seat through a cutter mounting rack, and a cutting-off cutter is fixedly connected to the lifting seat; the cutter seat is further provided with a locking rod capable of connecting the separation and combination support with the cutter seat; the lifting seat is provided with a movable pin capable of being inserted into the cutter seat, and the shell is provided with adrive part for driving the movable pin to move. The edge-covering sewing machine has the advantages that fabric edges, the edge-covering strips and the bottom-surface threads are cut off by using thepower source of the edge-covering strips and bottom-surface threads, the cutting off is automatically controlled through an inductor and a controller, and high efficiency is achieved.