The invention relates to a method for preparing a flour of lipid-rich microalgae, which comprises the following steps: (a) providing a biomass of microalgae comprising more than 50% lipids per dry weight of biomass (b) lysing the microalgae (c) concentrating the microalgae lysate to a solids content of more than 25 wt %, preferably to a solids content of 35 wt % to 50 wt % (d) applying a thermal treatment to the lysate thus concentrated (e) homogenising the lysate obtained in step (d) under high pressure, so as to obtain a stable emulsion and (f) drying said emulsion in order to obtain the microalgae flour.
