Wear-resistant firm deep groove ball bearing

The invention provides a wear-resistant firm deep groove ball bearing, which relates to the field of bearings and comprises an outer ring, an inner ring and a ball retainer, the outer ring is formed by connecting two groups of semi-circles through inner hexagon bolts in a penetrating manner, the two ends of the inner side of each semi-circle are connected with sealing baffles through screws respectively, the middle of the inner ring is of a concave ring groove structure, clamping tables are arranged at the front side end and the rear side end of the inner ring respectively, and the outer ends of the clamping tables are connected with outer baffle rings through bolts; the ball retainer is formed by butting and inserting two groups of semicircular retainers, four groups of ball clamps and three groups of lubricating cylinders are respectively arranged on the semicircular retainers, balls are respectively and movably clamped in the ball clamps, and lubricating oil is filled in the lubricating cylinders. The holl