Water level regulator system of an irrigation channel constituted by a portable receiver channel (1), intended to be placed inside an irrigation channel and that feeds on the water flowing through said irrigation channel, inside which pivotally fix at least two regulating elements (2) of the water level acting by flotation, each regulating element (2) constituted by a gate (3) that includes in its lower zone a flotation means (4), being fixed the gate (3) at the bottom of the receiving channel (1) by means of a tilting fixing means (5) and to the side walls of the receiving channel (1) by means of a flexible waterproof means (6), which is also fixed to the wall of bottom of the receiving channel (1) as well as its lateral edges by means of suitable fixing means (7).Sistema regulador del nivel de agua de un canal de riego constituido por un canal receptor portable (1), destinado a situarse en el interior de un canal de riego y que se alimenta del agua que fluye por dicho canal de riego, en cuyo interior se fijan de manera pivotante al menos dos elementos reguladores (2) del nivel de agua que actúan por flotación, cada elemento regulador (2) constituido por una compuerta (3) que incluye en su zona inferior un medio de flotación (4), estando fijada la compuerta (3) al fondo del canal receptor (1) mediante un medio de fijación basculante (5) y a las paredes laterales del canal receptor (1) mediante un medio impermeable flexible (6), el cual también se fija a la pared de fondo del canal receptor (1) así como a sus bordes laterales mediante sendos medios de fijación adecuados (7).