The invention discloses an oil cooling bearing. A bearing cover is located above a bearing block, a bearing bush is fixed to the bearing block, a cooling oil groove in the axial direction is formed in the inner diameter side of the bearing bush, an oil inlet hole is formed in the middle portion of the cooling oil groove, and the two ends of the cooling oil groove are provided with hot oil discharging ways; a bearing cooling structure comprises a cooling cavity and a cooling body, the cooling body is located in the cooling cavity, the cooling cavity is provided with a hot oil inlet and a cold oil outlet, an oil inlet is communicated with the cold oil outlet of the cooling cavity, and the hot oil discharging ways are communicated with the hot oil inlet of the cooling cavity; and the cooling body comprises a cooling pipe, a bottom hole runner separating plate and a top hole runner separating plate, and the bottom hole runner separating plate and the top hole runner separating plate are distributed in the cooling cavity between the hot oil inlet and the cold oil outlet in a spaced manner. The high heat exchange efficiency is achieved, alarm halting caused by too-high oil temperature can be effectively prevented, and the bush abrasion or burning phenomenon caused by the too-high bearing bush and cooling oil can be effectively avoided.