The present invention relates to a floor grinding device for loaders, and in forklifts floor grinding apparatus, the grinding apparatus 100 includes a base 10; The first and the second grinding unit 20, 30 to be provided on the lower left and right sides of the base 10 is subjected to grinding and the ground; And fork insert board (40) which is installed at a 45-degree angle at the upper portion of the base 10 accommodating the fork (2) of a forklift (1); It is securely fixed to the front and rear side of the base 10, the first and second grinding portion (20, 30) the moving member 50 to move to the ground portion; on the bar, a forklift fork, characterized in that consisting of the first grinding stage by operation by the attraction to the first grinding and the second grinding 45-degree angle section, with the running of the forklift combines a floor grinding machine to eliminate the non-working dead zone, by driving the turning means is provided on the base and the by changing two grinding position of the parts, especially in wall and adjacent work area can be as much as possible working with the US workspace to increase the efficiency of operations, and during storage of the floor grinding machine, adjust the height of the castor easily in places that can not be forklift jinchulip It has the advantage that you can keep.