The invention discloses a concurrent boiler utilizing a double-tangential circle combustion hearth. Two flame tangential circles are formed by at least eight combustors in a hearth of the concurrent boiler, wherein the hearth comprises an upper part hearth, a lower part hearth connected with the upper part hearth, and an ash bucket connected with the lower part hearth; the hearth is internally provided with a water cooling system and the water cooling system comprises the ash bucket and a spiral pipe ring on the lower part hearth, and a vertical pipe ring arranged on the upper part hearth; and the vertical pipe ring is connected with the spiral pipe ring through a middle mixing container. The concurrent boiler utilizing the double-tangential circle combustion hearth, disclosed by the invention, reduces the over-concentrated heat load, and the flame fullness degree in the hearth is the best, so that the heat absorption deviation caused by the water cooling system at different positions is reduced.