Biomass burner comprising: - a lateral shell having an axis of main development, - a bottom provided in a lower end of said lateral shell to delimit said lateral shell at the lower part in order to internally define a compartment to contain the biomass, said bottom being able to support the biomass inside said containing compartment and being provided with one or more first holes configured for the introduction of primary air into said containing compartment, said lateral shell comprising an upper end edge opposite said lower end, which delimits an aperture for generating the combustion flame, diametrically opposite said bottom along said axis of main development, - at least one introduction pipe configured to receive secondary air to be supplied for the combustion of gases generated by the biomass, said introduction pipe being provided with one or more second holes for delivering the secondary air, wherein said introduction pipe is disposed inside said containing compartment in correspondence with said upper end edge of the lateral shell, substantially at the height of said aperture and inside the perimeter of the upper end edge delimiting said aperture, said introduction pipe extending transversely to the axis of main development of said lateral shell so that said one or more second holes substantially affect at least part of the transverse extension of said aperture, characterized in that said burner comprises a plurality of elements for the entry of tertiary air associated with the upper end edge of the lateral shell in correspondence with said aperture, said entry elements being configured to cooperate with said at least one pipe for introducing secondary air and having a distribution along the lateral shell mating with the shape of said at least one pipe for introducing secondary air and of the aperture. - a lateral shell having an axis of main development, - a bottom provided in a lower end of said lateral shell to delimit said lateral shell at the lower part in order to internally define a compartment to contain the biomass, said bottom being able to support the biomass inside said containing compartment and being provided with one or more first holes configured for the introduction of primary air into said containing compartment, said lateral shell comprising an upper end edge opposite said lower end, which delimits an aperture for generating the combustion flame, diametrically opposite said bottom along said axis of main development, - at least one introduction pipe configured to receive secondary air to be supplied for the combustion of gases generated by the biomass, said introduction pipe being provided with one or more second holes for delivering the secondary air, wherein said introduction pipe is disposed inside said containing compartment in correspondence with said upper end edge of the lateral shell, substantially at the height of said aperture and inside the perimeter of the upper end edge delimiting said aperture, said introduction pipe extending transversely to the axis of main development of said lateral shell so that said one or more second holes substantially affect at least part of the transverse extension of said aperture,