He studied Secondary Education in Pontevedra. Some years later he studied Law at Santiago University. When he finished his career, he became the editor of the newspaper 'Galicia', where people like Castelao, Risco, Maside and Villar Ponte also collaborated.In 1924, Valentín was sentenced to a month in prison because of his journalistic articles. In 1931 he was candidate for deputy in Pontevedra.After the military revolt against the Republica, he was exiled to Verín and Sierra de Queixa. Later he was exiled to Villanueva de la Serena (Extremadura). In 1939, he married Pilar Rodríguez de Prada. In 1942, he became the editor of the magazine 'Industrias Pesqueras' and in 1950 he travelled to Buenos Aires, as he had been invited by the Galician Centre in that city.In 1964, he became a member of the Galician Academy making a speech titled A Galeguidade na obra de Guimaraes Rosa.After Franco's death, he took part in the so-called 'Comisión de los 10', which was a democratic political group. Some other people in this group were Cañellas, Felipe González, Tierno Galván...In 1977, he became a Senator in Pontevedra, being a candidate within the Galician Democratic Candidature.
Valentín Paz Andrade published many journalistic articles. As a lawyer, he showed his worry about the social and economical reality in Galicia in books such as Pranto matricial, Galicia como tarea, Sementeira do vento, La marginación de Galicia, El capital como factor del desarrollo de Galicia, El sistema económico de la pesca en Galicia, Producción y fluctuación de las pesquerías, Los derechos sobre el espacio marítimo.His versatile personality led him to publish some poetry books such as Pranto matricial (1954), Sementeira do vento (1968), Cen chaves na sombra (1979) and some essays like La Anunciación de Valle Inclán (1967), Transferencias etnológicas de Galicia en el Brasil Ulterior (1976), and A galecidade na obra de Guimaraes Rosa (1978).Paz Andrade also reflected his worry about politics in books such as O modelo federal para a constitución do Estado galego and Testimuñas e prespectivas de homenaxe ao Seminario de Estudos Galegos (1978).Besides, he published the most important biography about Castelao that exists nowadays, titled Castelao na luz e na sombra (1982).