The utility model relates to a combined checker brick with two different brick type structures, and can effectively solve the problem that the heat exchange capacity of a heat accumulator checker brick is required to be improved under the condition of the given heat exchange area per unit volume. The combined checker brick is a regular hexagon consisting of a 19-hole checker brick part and a 37-hole checker brick part; conical checker holes are formed between two end surfaces of the 19-hole checker brick part and between two end surfaces of the 37-hole checker brick part respectively; total seven grooves comprising circular grooves and central grooves are formed on the lower part of each checker brick; positioning bosses are formed on each checker brick; the positions of the positioning bosses alternately correspond to those of the circular grooves; and the hole pitch of the 37-hole checker brick part is 0.75 time that of the 19-hole checker brick part, and the 37-hole checker brick part and the 19-hole checker brick part are combined to form the combined checker brick. The pressure regulation and flow equalization effects on the airflow and the improvement on the heat transfer effect between the airflow and the wall surfaces of the checker holes are fully realized; and the convenience is provided for adjusting the heat exchange capacities of upper and lower different parts of a heat accumulator.