A filtering and compacting device for solid particles suspended and contained in fluids, such as slurries produced by mechanical operations, comprises a container (11), provided with a cover (12) and an openable bottom (13), and includes an inlet mouth (91) of the fluid to be treated, means for placing the container (11) under pressure, means (20) for opening the bottom (13) of the container (11), in which bottom (13) there is located a first filtering element (90) for retaining the solid particles internally thereof and at least a second filtering element (30) which defines a filtration chamber (31), in which the filtration chamber (31) overlies a compacting chamber (32) of filtered slurry.