Device for holding greenhouse plastics, comprising pairs of male (1) and female (2) elements; where the male element (1) fits into a channel (5) of the female element (2) delimited by a bottom (2a) and two opposite side walls (2b) having end edges that define a mouthpiece (4) in the that the channeling (5) ends; a plastic laminar cover (3) being held between the male (1) and female (2) elements; characterized in that it comprises at least one first mechanical retention located at the height of a part of a constriction of the mouthpiece (4) of the female element (2) and of a part of a narrowing of the male element (1); where at least two inclined portions (8) of said mouth (4) converging outwards are facing with two other inclined portions (9) complementary to the male element (1) located in correspondence with two opposite recesses (7) of the narrowing of the male element (1); wherein the laminar cover (3) is held at least by said first mechanical retention. (Machine-translation by Google Translate, not legally binding)1. Dispositivo para sujeción de plásticos de invernaderos, que comprende pares de elementos macho (1) y hembra (2); donde el elemento macho (1) encaja dentro de una canalización (5) del elemento hembra (2) delimitada por un fondo (2a) y dos paredes laterales opuestas (2b) que tienen unos bordes extremos que delimitan una embocadura (4) en la que desemboca la canalización (5); sujetándose entre los elementos macho (1) y hembra (2) una cubierta laminar (3) de plástico; caracterizado porque comprende al menos una primera retención mecánica ubicada a la altura de una parte de un estrechamiento de la embocadura (4) del elemento hembra (2) y de una parte de un estrechamiento del elemento macho (1); donde al menos dos porciones inclinadas (8) de dicha embocadura (4) convergentes hacia fuera están enfrentadas con otras dos porciones inclinadas (9) complementarias del elemento macho (1) ubicadas en correspondencia con dos entrantes opuestos (7) del estrechamie