An ignition tank for an ignition cabinet of a mixer disclosed by the invention relates to a part of pulse ash blowing equipment. The invention aims to provide the ignition tank for the ignition cabinet of the mixer and the ignition tank is full in mixing, quick to ignite and simple in structure. The ignition tank for the ignition cabinet of the mixer comprises a tank body, and a gas inlet pipe, a combustion-supporting gas inlet pipe, an ignition device and a combustion extension pipe which are connected to the tank body; a partition plate is arranged in the tank body; the two ends of the partition plate are abutted against the inner wall of the tank body; a ventilation hole is formed in the partition plate; the tank body is partitioned by the partition plate to form a mixing chamber and a combustion chamber; the wall surface of the mixing chamber is connected with the gas inlet pipe and the combustion-supporting gas inlet pipe; the wall surface of the combustion chamber is connected with the ignition device and the combustion extension pipe.