Wood patching system for patching defects in a wood surface H by milling a groove H1, which can be sealed again by means of a patching strip R, comprising - a milling machine F with a cylindrically acting, rotating wood machining tool F1, - of which the longitudinal axis is oriented parallel to the wood surface H and - which can be rotated by means of a motor F2 and - a patch strip R in each case for each defect, wherein - the patch strip R with its patch top face R1 facing away from the patched wood surface H is rectangular and - the end faces R2 of said patch strip are shaped as cylindrical segments, which merge tangentially into the patch underside R3, and - the profile of the patch strip R, transversely to its longitudinal direction, is essentially rectangular, characterised in that - at least one of the two corners of said profile is rounded between the patch underside R3 and the two patch side walls R4 or is shaped as a narrow plane that is oriented obliquely to the other surfaces, which is also designated a chamfer R5, and - the milling machine F, on the underside of its base plate F3, has a guide groove F6, in which a guide ruler S1 engages, which rests on the wood surface H and guides the milling machine F in a straight line during displacement on the wood surface H, - wherein, in the guide groove F6 on both sides of the guide ruler S1, one sliding piece in each case is inset and the distance of at least one sliding piece to the guide groove F6 can be changed by means of a setting screw, by means of which the play of the guide ruler S1 in the guide groove F6 is adjustable, and - at both ends of the guide ruler S1, a pointer S2 in each case is formed approximately at a right angle, wherein the tips of the pointers S2 mark the plane of a side wall of a groove H1. - a milling machine F with a cylindrically acting, rotating wood machining tool F1, - of which the longitudinal axis is oriented parallel to the wood surface H and - which can be rotated by means of a motor F2 and - of which the longitudinal axis is oriented parallel to the wood surface H and - which can be rotated by means of a motor F2 and - a patch strip R in each case for each defect, wherein - the patch strip R with its patch top face R1 facing away from the patched wood surface H is rectangular and - the end faces R2 of said patch strip are shaped as cylindrical segments, which merge tangentially into the patch underside R3, and - the profile of the patch strip R, transversely to its longitudinal direction, is essentially rectangular, - the patch strip R with its patch top face R1 facing away from the patched wood surface H is rectangular and - the end faces R2 of said patch strip are shaped as cylindrical segments, which merge tangentially into the patch underside R3, and - the profile of the patch strip R, transversely to its longitudinal direction, is essentially rectangular, - at least one of the two corners of said profile is rounded between the patch underside R3 and the two patch side walls R4 or is shaped as a narrow plane that is oriented obliquely to the other surfaces, which is also designated a chamfer R5, and - the milling machine F, on the underside of its base plate F3, has a guide groove F6, in which a guide ruler S1 engages, which rests on the wood surface H and guides the milling machine F in a straight line during displacement on the wood surface H, - wherein, in the guide groove F6 on both sides of the guide ruler S1, one sliding piece in each case is inset and the distance of at least one sliding piece to the guide groove F6 can be changed by means of a setting screw, by means of which the play of the guide ruler S1 in the guide groove F6 is adjustable, and - at both ends of the guide ruler S1, a pointer S2 in each case is formed approximately at a right angle, wherein the tips of the pointers S2 mark the plane of a side wall of a groove H1.