The invention relates to an agrochemicals pre-dilution unit comprising a mixing device that receives and mixes water and agrochemical. This unit carries out the mixing process by means of a plurality of pumps in fluid communication with the mixing device, which sends the prepared mixture a tank truck through outlet pipes. A plurality of bulks are installed in the unit and contain agrochemicals that are pumped in a controlled and precise manner to the mixing device, allowing a mixture of agrochemicals and water to be prepared with minimum human intervention. Also disclosed is the preparation of the liquid mixture controlled by a PLC, which enables an operator to obtain an accurate mixture without needing to intervene directly in the unit, since the operator can interact with the unit by means of a computer, such that such that the PLC controls all the devices in unit in order to prepare the mixture.
