Abstract: A device for levelling and separating floor tiles, comprising:—a body with a supporting base (11) for the tiles (B) and a separator element (12) linked to said base (11) by pre-weakened break points (13), and—a levelling wedge (2) suited to be inserted into a window (14) in the separator element (12) and which comprises a lower surface (21) for support on the tiles (B) and an upper surface (22) with a plurality of teeth (26) presenting superiorly, in a transversal direction, a curvature, defining therein:—a higher central area (26a) for initial contact with a central part (14a) of the upper end of the window in the separator element (12) and—laterally descending areas (26b) for progressive contact with lateral parts (14b) that are more remote from said central part (14a) of the window (14).