The invention discloses a scattering type coal supply device which comprises a combustor furnace wall and a coal drop pipe, wherein a scattering air device is arranged outside the coal drop pipe and comprises an arc plate and a lateral seal plate; an arc interlayer air channel with an open lower end is formed between the arc plate and the outer wall of the coal drop pipe; and a scattering air inlet is formed in the upper end of the coal drop pipe, communicated with the arc interlayer air channel and connected with a primary air pipe of a boiler through a scattering air chamber formed outside the coal drop pipe. According to the scattering type coal supply device, the scattering air device is added on the coal drop pipe, after fire coal enters a combustor through the coal drop pipe, the fire coal moves forwards for a certain distance under the action of scattering air and is not directly contacted with the combustor furnace wall, and accordingly, the phenomena of bonding and coking due to direct contact of the fire coal and the combustor furnace wall are avoided.