A grader moldboard structure, comprising a left moldboard, a plurality of middle moldboard having the same structure, and a right moldboard that are sequentially connected to form a long stripe-like moldboard body； wherein two sides of the middle moldboard are each provided with a non-strike-through transverse half-waist circular groove and a semi-circular hole in the groove, connection edges of one sides of the left moldboard and the right moldboard are each provided with a non-strike-through transverse half-waist circular groove and a semi-circular hole in the groove, the two half-waist circular grooves being spliced to form a waist circular groove for inserting a connection block, a positioning circular hole corresponding to a circular hole formed in the middle of the waist circular groove being provided in the middle of the connection block.
