The invention discloses a ladder-like movable fire bar suitable for a large-particle solid fuel, and aims at providing a movable fire bar capable of crushing coke automatically and having the function of automatic cleaning. A fire bar body comprises a first fuel slip area at the upper part, a first fuel main combustion area in the middle and a first deslagging area at the lower part, the upper end surface of the first fuel slip area is an inclined surface, a rocking support groove matched with a rocker is arranged below the first fuel slip area, the first fuel main combustion area is in a ladder shape, the upper end surface of the first deslagging area is a plane, and a support surface is arranged on the lower surface of the first deslagging area. A first fire grate gap control block is arranged on each of the two sides of the first fuel slip area, and the first fire grate gap control block and the upper end surface of the first fuel slip area are arranged in an inclined manner. The part of the movable fire bar in the main combustion area is in a ladder shape, so that the size of the coke is reduced, meanwhile, automatic crushing of cokes and automatic cleaning of slag are promoted.