[en] The neutron diffraction analysis of the Ba(TiCo)₂Fe₈O₁₉ compound in the temperature range from 4.2 to 290 K is carried out. Co-existence of the heliocoidal magnetic structure of the SS-type and the collinear antiferromagnetic one is found-out. The helicoidal structure has a block character, the spiral coherence length along c vektor axis is approximately 150 A at T = 77 K, the spiral period is incommeasurable with the atomic one all over the temperature range and increases beginning from 36 A at T = 4.2 K upto 210 A at T = 290 K. The dimension of regions with antiferromagnetic ordering is not less than 500 A. The supposition is made that the character of the Ba(TiCo)₂Fe₈O₁₉ magnetic structure is due to inhomogeneity of Fe³⁺ ion substitution in nonequivalent crystallographic positions occurring at low (Ti+Co) concentrations