Ammonia-coal co-combustion burner and ammonia-coal co-combustion boiler

The invention relates to an ammonia-coal co-combustion burner and an ammonia-coal co-combustion boiler. The burner comprises a first barrel, a second barrel and a third barrel, the ignition source is arranged in the first barrel and is configured to ignite the pulverized coal; the co-combustion cavity is arranged in the first barrel and is located on the downstream of the ignition source in the flowing direction of the primary air in the first barrel, and the two ends, in the flowing direction of the primary air, of the co-combustion cavity are open so that pulverized coal ignited by the ignition source can be conveyed to the co-combustion nozzle; the first ammonia fuel nozzle is configured to inject ammonia fuel into the co-combustion cavity; the second ammonia fuel nozzle faces the inner cavity of the first barrel so as to inject ammonia fuel into the first barrel, and the second ammonia fuel nozzle is located between the co-combustion cavity and the co-combustion nozzle in the flowing direction of the prim