The invention discloses a point cloud normal vector redirection method and device based on uniform grid local focusing. The method includes the steps of firstly, rasterizing the largest area where point cloud is located to form a three-dimensional cube based on uniform grids; secondly, conducting layer-by-layer scanning and focus setting on the three-dimensional cube in all directions; thirdly, conducting local focusing and redirection on the normal vector of a point in each grid where the focus is set and the point is located, and marking the points which are redirected; fourthly, judging whether points which are not redirected exist or not, if yes, conducting rasterizing and local focusing and redirection again after random rotation is conducted once, and if not, ending redirection. The device comprises a rasterizing module, a scanning module, a redirection module, a first judgment module and a second judgment module. According to the method and the device, the normal vectors of the points in the point cloud can be accurately redirected.