A processing method of scattering points with the equidistant V-shaped grooves is studied, which is used for the plastic fiber array. A blade carving technique is presented using gravity micro-pressure. The relationship between the light scattering rate of the scattering point and the weight mass providing gravity is analyzed theoretically. The results show that the light scattering rate of V-groove scattering points increases with the increase of the weight mass, in the form of 3/2 power exponent. The uniform luminescence model with isometric scattering points is established. According to the condition of each scattering point in machining, the formula of weight mass for machining is deduced theoretically. Experiments verify the relationship between the light scattering rate of V-groove scattering points and weight quality, and the relation curve between them is obtained. Using the parameters obtained from the formula of weight mass, a single side luminescent plastic fiber with equidistant scattering points is fabricated, and its luminance uniformity is higher than 85%. The 180 mm×101 mm backlight plate of plastic fiber array with isometric scattering points is fabricated, and its brightness uniformity is 90.9%. The experimental results show the feasibility of preparing the V-groove scattering points for plastic fiber array by gravity micro-pressure blade carving.