A forward pull type bolt lock structure of a slide includes an outer rail provided with first and second locking blocks. An inner rail is received in the outer rail and is provided with a mounting hole for a pivot member to pivot one end of a positioning member whose other end is provided with a guide block. The positioning member has one side having a press bar supported on one lip of the inner rail, and the other side provided with a cutout and a stop portion. A slide plate is received between the inner rail and the outer rail, and provided with a drawing block for drawing the slide plate to move in the inner rail. The slide plate is provided with a guide slot having an oblique guide face. The guide block of the positioning member is supported on the oblique guide face.