A heat storage type combustion system equipped with a disk type distributor having improved sealing according to the present invention, the system includes: the distributor having a rotary distribution unit, a lower distribution unit located on the underside of the rotary distribution unit, an upper distribution unit located on the top of the rotary distribution unit, and a plurality of dumb buckles disposed equally spaced apart from each other along outer circumferential rims of the lower distribution unit and the upper distribution unit to fix the lower distribution unit and the upper distribution unit to each other. Each dumb buckle includes a left-handed screw and a right-handed screw formed on both end portions around the body thereof in such a manner as to be tightened or loosened repeatedly if necessary, and the number of dumb buckles is 4 to 12 in accordance with the sizes of the distributor. The state of the operating distributor is checked by naked eyes, and if the distributor is inclined or a given portion of the distributor is worn out, the distributor is returned to its normal state by means of the manipulations of the dumb buckles at the outside.