The utility model relates to an excavator steel knife which may be a substitute of excavator cutting teeth. The detailed technical proposal is: the excavator is characterized in that a thick steel plate is processed into a steel knife and arranged at one side of an excavator bucket and the parts to be dug in a tunnel is repaired with the knife-edge and knife-point of the steel knife. The excavator steel knife has the advantages of: 1. simple structure and easy manufacturing; 2. centralized action force and accurate action point; 3. low cost and high efficiency.