The invention relates to a horizontal bias internal-combustion igniter and main pulverized coal burner which mainly comprises a primary air channel, a horizontal bias separating device, a high-intensity igniting gun, a pulverized coal supplemental firing chamber, a bias separating baffle and a perimeter air channel. The horizontal bias internal-combustion igniter and main pulverized coal burner inserts the high-intensity igniting gun in the pulverized coal supplemental firing chamber from the lean phase side of the pulverized coal burner, primary air-coal at the dense phase side is heated to ignition temperature of the pulverized coal, volatile components in the pulverized coal quick separate out and burn, and charcoal materials are simultaneously heated and burned to form high-temperature flames which are ejected into a furnace chamber so as to achieve the purposes of ignition and pulverized coal burning. In the progresses of furnace-starting ignition, furnace-shut-down combustion supporting and low-load stable burning, the burner greatly saves fuel, and the fuel saving rate can reach 80-100%. The horizontal bias internal-combustion igniter and main pulverized coal burner is applicable to boiler furnaces conducting the direct tangential firing of different kinds of coal, ensures no slag bonding and no ablation of the firing chamber, and has the advantages of reliable operation, low investment and operation cost and wide applicability.