Studies were carried out to experimentally substantiate the production of cement composite building materials based on liquid lignosulfonates (LCL). The chemical composition, physicochemical and physico-mechanical properties of liquid lignosulfonates and high-alumina cement have been studied. The method of mathematical planning of the experiment and modeling established the optimal composition of the composition. It has been established and substantiated that when obtaining lignocement compositions, the interaction of lignosulfonate with the components of aluminous cement occurs, which is accompanied by an increase in the hydrophobicity of the obtained compositions and, accordingly, a decrease in the water absorption capacity of the samples. It is shown that the obtained lignocement compositions have a lower density in comparison with foam blocks, i.e. the developed method makes it possible to obtain a lighter building material with high strength characteristics and moisture resistance.