A device for shaping and recoverable formwork walls.; This device comprises parts (1a, 1b, 1c, 1d, 1e) substantially prismatic formed into a non-porous and include materials: - side walls (12), - front walls (11), - a closing wall ( 13), top or bottom, provided with at least an appendix (14) projecting and - at least one end face (15), lower or higher, that complies with the corresponding appendage (14) complementary coupling means for stacking stable successive pieces (1a, 1b, 1c). The appendixes (14) and / or the mouths (15) have a configuration that allows removal of the formwork by lateral folding or oblique movement of successive pieces (1a, 1b, 1c, 1d, 1e). Said parts (1a, 1b, 1c, 1d, 1e) comprise outwardly in at least one of the front walls (11), means for defining reliefs on the surface of the work defined by said front wall formwork.
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