The invention discloses a spherical-groove knuckle bearing. Bearing inner rings are mainly formed by spherical bases with through holes and spiral grooves or circular arc line grooves distributed on the surfaces of the spherical bases; the spiral grooves or the circular arc line grooves are formed on spherical outside surfaces of the bearing inner rings; groove depths in the spiral grooves or the circular arc line grooves are gradually changed; the groove depth change trends of the grooves at different channels are different; according to any two adjacent grooves along the same direction, the groove depth of one groove is deep from shallow, and the groove depth of the other groove is shallow from deep. According to the spherical-groove knuckle bearing provided by the invention, a dynamic pressure lubrication effect can be enhanced, a lubricating film is thicker, the bi-directional axial load can be borne at the same time, the bearing capacity is higher, and lubricating films among mating faces in the bearing flow, so that a lubricating effect of all lubricating greases is fully achieved.