Guinovart was a Contemporary painter and printmaker. A member of the Dau Al Set group of artists, he was also a co-founder of the Tahull group, with other Spanish artists Jaume Muxart Domenech, Antoni Tàpies, and Joan Josep Tharrats.
Trained at the School of Arts in Llotia, Spain, he traveled to France in 1952, where he discovered artists such as Henri Matisse and Paul Cézanne, and movements such as Cubism. During his first years as an artist, he worked on murals, illustrations, advertisements, and theatre sets.
While his early works were figurative, his style gradually evolved to incorporate more social themes. He soon began experimenting with materials and objects, and created assemblages and collages. He became known for works which incorporated symbols and created a dialogue between the different elements of the composition.
He has received the leading arts prize in Spain, the Premio Nacional de Artes Plásticas, from the Spanish government. His works can also be found in numerous museums and public collections, including the Casa de las Américas, Havana, Cuba; the Fine Arts Museum of Long Island, New York; the Contemporary Art Museum, Barcelona; the Museum of Modern Art, México City; the Museum of Fine Arts, Bilbao; the Guggenheim Museum, New York, the Museo de Lissone, Milan; the Museo de Marcay, Venezuela; the Museo de Arte Contemporáneo, Caracas, Venezuela; the Museo Carrillo Gil, México; the Museo Nacional Centro de Arte Reina Sofía, Madrid; the Museo de San Telmo, San Sebastián; the Bocchum Museum, Germany; and the Chase Manhattan Bank Collection, New York.