A double concave drill for dental implant comprising: a shank, an intermediate connecting area, a working section； the shank has a tang part which includes a notch and an annular groove in order to be attached with a dental handpiece； the intermediate connecting area has a colored depth scale to provide for depth marker thus allowing the dentist to accurately position the drill； the working section includes several levels and a cutting tip, the levels have a cutting function, and the diameters of the levels are gradually reduced from the top level downwards, and the cutting tip has a specially designed symmetrical plane for fixing the drilling direction to avoid the drill bit sliding, in addition, one side of the working section and the symmetrical side of it both have a concave extending from an uppermost level to a lowermost level, and each concave and each level form cutting edges.
