The utility model discloses a rock wool board after improvement, including the rock wool edition of books body, all be provided with trapezoidal form sand grip on the up end that the rock wool edition of books was personally experienced sth. Part of the body and on the left end face, the circular -arc sealing strip of fixedly connected with on the outside terminal surface of sand grip, all be provided with the trapezoidal groove that can coordinate the joint with the sand grip on the lower terminal surface that the rock wool edition of books was personally experienced sth. Part of the body and on the right -hand member face, the recess inboard is provided with the arc form seal groove that can cooperate the joint with the sealing strip, be provided with on the lower surface of the rock wool edition of books body and be horizontal and vertical even crisscross convex layering that distributes, the utility model discloses a setting that sand grip and recess were gone up to the rock wool edition of books body to and the setting of the setting of sand grip upper seal strip and the inboard seal groove of recess, avoided the inefficacy of the original function of the rock wool edition of books body, setting through the layering to avoid air, moisture, sound etc. To pass from the space between the rock wool edition of books body and the wall body, avoided the inefficacy of the original function of the rock wool edition of books body.