Automatic filter for slurry, intended for incorporation into a machine (2) to apply slurry by sprinkler system (3) of hydraulic drive, and formed from a box consisting of a prismatic body (4), through which the product passes by gravity or pressure, with a top cover (5), an internal mesh (6), formed by an orchestrated metal plate, and a side door (7) to access the internal mesh (6) to proceed to the extraction and cleaning thereof, it is characterized by having means for automatic opening and closing of said side door (7). (Machine-translation by Google Translate, not legally binding)