The book discusses issues related to the development and use of unique devices - explosive magnetocumulative generators of ultra-strong magnetic fields. The content and results of many years of work at RFNC-VNIIEF on the development of the idea of ​ ​ magnetic accumulation of energy of explosives proposed by A. D. Sakharov to the level of a physical method for obtaining magnetic fields of the multi-megagauss range are described. Descriptions and parameters of physical devices - cascade generators MK-1 10- and 20-megahauss ranges are given.