Machine for treatment of an agricultural field, in particular to prepare the soil for the sowing, the machine being towed by a tractor, comprising: - a supporting structure, having a front part that is lifted up and connected to a tractor, and a rear part that is lowered down directly to the soil to be treated, said structure having a longitudinal horizontal axis that is inclined; - a series of rotating shafts (101a, 101b,..., 101f) connected to said supporting structure, each parallel to the other and placed according to the same inclined axis of the structure, having their front ends jointed to respective gears (107a, 107b,..., 107f) connected to a power source on the engine of the tractor that gives a rotary power supply, and having their rear ends connected to respective operating tools (105a, 105b,..., 105f) placed in a coaxial and concentric way to the same rotating shafts (101a, 101b,..., 101f), so that the same operating tools (105a, 105b,..., 105f) are assembled at the lower part of the structure and are in contact with the soil; said operating tools (105a, 105b,..., 105f) have a radial symmetry and comprise some rotary blades that enter in contact radially and deeply into the soil, so that the passage of the machine achieves to break down the clumps into small pieces very efficiently, until they are crumbled to a very thin granularity, characterized in that further comprising: - guiding and/or lifting means, connected to said supporting structure of the machine, that include one or more wheels, slides or cylinders, and one or more telescopic rods with a mechanism blocking the height from ground, so that said wheels, slides or cylinders permit to decrease the friction arising from dragging on the soil, and achieve a direction in motion of machine, while the telescopic rods permit to change and fix the height of the machine from ground, giving a specific inclination of the longitudinal axis and therefore, as a consequence, a specific level of depth into the soil for the above said operating tools with respective rotating blades. - a supporting structure, having a front part that is lifted up and connected to a tractor, and a rear part that is lowered down directly to the soil to be treated, said structure having a longitudinal horizontal axis that is inclined; - a series of rotating shafts (101a, 101b,..., 101f) connected to said supporting structure, each parallel to the other and placed according to the same inclined axis of the structure, having their front ends jointed to respective gears (107a, 107b,..., 107f) connected to a power source on the engine of the tractor that gives a rotary power supply, and having their rear ends connected to respective operating tools (105a, 105b,..., 105f) placed in a coaxial and concentric way to the same rotating shafts (101a, 101b,..., 101f), so that the same operating tools (105a, 105b,..., 105f) are assembled at the lower part of the structure and are in contact with the soil; said operating tools (105a, 105b,..., 105f) have a radial symmetry and comprise some rotary blades that enter in contact radially and deeply into the soil, so that the passage of the machine achieves to break down the clumps into small pieces very efficiently, until they are crumbled to a very thin granularity, - guiding and/or lifting means, connected to said supporting structure of the machine, that include one or more wheels, slides or cylinders, and one or more telescopic rods with a mechanism blocking the height from ground, so that said wheels, slides or cylinders permit to decrease the friction arising from dragging on the soil, and achieve a direction in motion of machine, while the telescopic rods permit to change and fix the height of the machine from ground, giving a specific inclination of the longitudinal axis and therefore, as a consequence, a specific level of depth into the soil for the above said operating tools with respective rotating blades.