A scarfing type scratching pad, comprises: a base board, the base board having a first surface and a second surface which is opposite to the first surface, and the base board also having a first side, a second side, a third side, and a fourth side, wherein these sides are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the first side, the second side, the third side and the fourth side all having a plurality of salients (1131, 1141, 1151, 1161); a plurality of side boards, the plurality of side boards having a first surface and a second surface which is opposite to the first surface, and the plurality of side boards also includes a first side, a second side, a third side, and a fourth side, wherein these side boards are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the third side is scarfed to the second side and the fourth side, in which the first side having a plurality of salients going through from the first surface and the second surface, in which the second side and the fourth side both having a plurality of salients; and a plurality of top boards, each the plurality of top boards includes a first surface and a second surface which is opposite to the first surface, and the top board also has a first side, a second side, third side, and a fourth side, wherein these sides are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the first side, the second side and the third side that all having a plurality of recess holes (1331, 1341, 1351) going through from the first surface and the second surface; wherein, the plurality of salients of the first side of the base board and the second side of the base board sequentially go through the plurality of recess holes of the first side of the side board, the plurality of salients of the second side of the side board and the fourth side of the side board sequentially go through the plurality of recess holes of the plurality of second side of the top board and the first side of the top board, and the plurality of salients of the third side of the base board and the fourth side of the base board sequentially go through the plurality of recess holes of the third side of the top board and a three-dimensional shape can be formed. a base board, the base board having a first surface and a second surface which is opposite to the first surface, and the base board also having a first side, a second side, a third side, and a fourth side, wherein these sides are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the first side, the second side, the third side and the fourth side all having a plurality of salients (1131, 1141, 1151, 1161); a plurality of side boards, the plurality of side boards having a first surface and a second surface which is opposite to the first surface, and the plurality of side boards also includes a first side, a second side, a third side, and a fourth side, wherein these side boards are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the third side is scarfed to the second side and the fourth side, in which the first side having a plurality of salients going through from the first surface and the second surface, in which the second side and the fourth side both having a plurality of salients; and a plurality of top boards, each the plurality of top boards includes a first surface and a second surface which is opposite to the first surface, and the top board also has a first side, a second side, third side, and a fourth side, wherein these sides are scarfed to the first surface and the second surface, wherein the first side faces to the second side and the third side faces to the fourth side, in which the first side, the second side and the third side that all having a plurality of recess holes (1331, 1341, 1351) going through from the first surface and the second surface; wherein, the plurality of salients of the first side of the base board and the second side of the base board sequentially go through the plurality of recess holes of the first side of the side board, the plurality of salients of the second side of the side board and the fourth side of the side board sequentially go through the plurality of recess holes of the plurality of second side of the top board and the first side of the top board, and the plurality of salients of the third side of the base board and the fourth side of the base board sequentially go through the plurality of recess holes of the third side of the top board and a three-dimensional shape can be formed.