Lubricating device for bearing

The utility model relates to a lubricating device for a bearing, which is provided with a main shaft, the bearing, a bearing seat and a bearing cover, wherein, an oil inlet pipe and an oil return pipe which are communicated with the bearing are arranged on the bearing cover; the oil inlet pipe is communicated with an oil delivery pipe which is communicated with an oil delivery pump which is communicated with the inner cavity of an oil storing tank which is directly communicated with the oil return pipe; a cooler is arranged in the oil storing tank. The device can cause the bearing to obtain sufficient lubrication, extend the service life of the bearing. The utility model has the advantages of simple structure, and convenient operation, and is especially suitable for devices which are provided with large-size bearings, such as an extruding machine, a crusher, etc.