The present invention relates to a mat lockstitch device. One aspect of the mat lock-stitch apparatus according to an embodiment of the present invention, the mat is supported on the upper surface of the support plate; A sensing unit detecting a position of the edge of the mat; A transfer unit for transferring the mat supported on the upper surface of the support plate; A lockstitch unit which locks the edge member along the rim of the mat conveyed by the transfer unit; A supply unit that supplies a rim member that is released from the rim member reel so as to be sewn to the rim of the mat by the lockstitch unit; A guide unit guiding the edge member supplied by the supply unit to surround the edge of the mat; And determining the shape of the rim of the mat according to the position of the rim of the mat sensed by the sensing unit, and the transfer unit and the lockstitch unit so that the rim member is sewn along the rim of the mat supplied as the rim member is being conveyed. Control unit for controlling the operation of the; Including, the guide unit guides the rim member to surround the rim of the mat while moving along the rim shape of the mat.
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