The invention provides an excavator dipper tooth. The excavator dipper tooth comprises a connecting portion connected with a dipper tooth body, an excavation portion and a dipper tooth body, and a mounting groove fixed to the dipper body is formed in the head of the connecting portion; the bottom face of the mounting groove is a concave curved face, and the mounting groove is an opened groove; a plurality of hemispheric protruding strips with the direction consistent with the depth direction of the opened groove are arranged on two side faces of the opened groove, and are matched with hemispheric grooves in the dipper body; the hemispheric protruding strips are arranged in parallel at intervals, and a mounting through hole is formed between every two hemispheric protruding strips; the connecting portion is fixed to the dipper body through the mounting through holes, and accordingly, connection is stable, and replacement is convenient; the excavation portion is connected with the connecting portion, and the dipper tooth body is arranged between the connecting portion and the excavation portion; and a plurality of reinforcing ribs are arranged on the dipper tooth body, and the mechanical property of the excavator dipper tooth can be improved. The excavator dipper tooth is simple in structure, the mechanical property of the excavator dipper tooth can be improved, breakage is prevented, and replacement is convenient.