A milling process of soya seeds, comprising following states: introducing rehydrating water into at least a rehydrator (1); introducing soya seeds into the rehydrator (1); waiting to enable absorption of part of the water by the soya seeds in order for the seeds to be rehydrated; extracting the soya seeds from the rehydrator (1); milling the soya seeds extract from the rehydrator (1) to obtain a slurry; characterised in that it further comprises at least a washing cycle of the soya seeds comprising stages of: introducing washing water into the rehydrator (1), in which rehydrator (1) the rehydrating water and the soya seeds have already been introduced; discharging at least a part of the water present in the rehydrator (1), which part of the water is in excess.
