The utility model discloses a quick dismantlement formula grate that chain boiler used belongs to the boiler production field, include: fire grate segment (1), grate base (2), fixed chain axle (3), its characterized in that: fire grate segment (1) is connected through the dovetail and the cooperation with trapezoidal connector of grate base (2) one end, and the other end of grate base (2) is connected through the shaft hole cooperation with fixed chain axle (3) through the shaft hole of self, the advantage of this grate is: to easily ruin a fire grate segment and grate base and separately make, and alleviate the weight when whole greatly, and make fire grate segment simple structure, the casting is easy, low cost, only need change when the fire grate segment damages the fire grate segment can, need not change the grate base, adopt in addition and dismantle the grate fast, change fire grate segment convenient and fast when boiler grate maintains, can save greatly and maintain and the running cost.