The invention discloses a fully-automatic numerical control ball bearing inner ring groove grinder. The grinder comprises a grinder body, a reciprocating working table, a grinding wheel journal box, a workpiece journal box, a grinding wheel dresser and a workpiece feeding mechanism, wherein the reciprocating working table is installed on the grinder body, the grinding wheel journal box is installed on the grinder body and located behind the reciprocating working table, a grinding wheel is installed on the grinding wheel journal box, and the grinding wheel dresser and the workpiece journal box are both installed on the reciprocating working table; two arc-shaped grooves are formed in a workpiece journal box base, a sliding screw is installed in each groove and is connected with the workpiece journal box to enable an included angle to be formed between a workpiece journal and a grinding wheel journal, and a supporting plate is arranged below the workpiece journal box base; a second base is arranged on a base of the grinding wheel dresser, two arc-shaped grooves are formed in the second base, the second base is connected with the base of the grinding wheel dresser through sliding screws on the arc-shaped grooves, and the grinding wheel dress is a linear dresser. By the adoption of the grinder, various products can be machined, and funds can be saved.