Valeriu Cosarciuc was born on 24 November 1955 in Clocușna, Ocnița District. He studied in 1972–1977 at the Polytechnic Institute of Chișinău (now Technical University of Moldova), obtaining a diploma of engineer specialized in machine building technology, lathes and tools. After graduating from the Faculty in 1977, he was employed as a technology engineer at the "Microprovod" in Chișinău. From 1980 he was transferred to the position of head of the technological group at "Moldselmaș" in the city of Bălți, being advanced in 1986 as the main technologist. Between 1989-1995 he served as head of the "Agroteh" factory of "Moldselmaș" and since 1995 he has been elected chairman of the Board of Directors of "Moldagrotehnica", whose task is to ensure effective economic and financial activity and enterprise development. During this time, he studied at the Academy of National Economy in Moscow (1990–1992).