Abstract: In machining, the turning temperature has an important influence on the surface quality of the workpiece and the service life of the tool. A tool with high-efficiency internal cooling capacity is designed in this article. The insert is provided with a fluid storage groove and a diamond-shaped rib is installed in the groove, which can realize the efficient cooling of the tool by the cutting fluid and reduce the cutting temperature of the tool during processing. Under the actual machining process parameters of rotation rate 600 r·min^-1, cutting depth 1.5 mm, workpiece diameter 90 mm, and feed rate 0.3 mm·r^-1, the cutting forces on the tool are calculated. Starting from the mechanical safety of the tool during cutting, the structural strength of the tool is analyzed. It is concluded that the maximum equivalent stress can reach 827.35 MPa when the blade is in cutting state, with the highest stress located near the tool tip position. The compressive yield strength of blade material YT5 is 4 GPa, which is much greater than the maximum stress value of the blade in this cutting state. Thus the internal storage tank structure of the blade has little effect on the structural strength of the blade, and it can meet the cutting strength requirements of blade.