Cutting tool with replaceable tool head structure

A cutting tool with a replaceable tool head structure, comprising:

• a tool holder, one end face of the tool holder having a positioning hole extending inward, the positioning hole being in a polygonal shape, a bottom of the positioning hole having two symmetrical positioning grooves in a V shape, the positioning hole having two symmetrical upright edges on two sides of a middle section thereof and a horizontal upper flat edge on a top thereof, the top of the tool holder being formed with a screw hole passing through the upper flat edge;
• a tool head, including a positioning shaft on one end thereof, the positioning shaft being in a polygonal shape, a bottom of the positioning shaft having two symmetrical positioning seats in a V shape, the positioning shaft having two symmetrical upright surfaces on two sides of a middle section thereof, a horizontal force-bearing surface on a top thereof, and a horizontal flat surface on the bottom, the force-bearing surface being formed with a tapered hole;
• and
• a screw, having a conical head on a front end thereof.