The invention discloses a composite electronic element comprising a shell (4), a bar magnet (1) and a magnetic induction element (2). The magnetic induction element (2) and the bar magnet (1) are fixedly arranged on the shell (4). The "0" magnetic point mid-position of the bar magnet (1) can move relative to the magnetic induction element (2) along arrangement direction from the N pole to the S pole of the bar magnet (1) under the effect of an external magnetic induction moving component. The induction surface of the magnetic induction element (2) faces one side, which is parallel to the arrangement direction of the N pole and the S pole of the bar magnet (1), of the bar magnet (1). The moving stroke of the "0" magnetic point mid-position passes through the induction surface of the magnetic induction element (2). The "0" magnetic point mid-position is the position, of which magnetic induction intensity is 0 millitex, of one side along the arrangement direction from the N pole to the S pole of the bar magnet (1). According to the composite electronic element, sensing accuracy of the composite electronic element can be enhanced.