Cutter for cutting intersecting line edge of inner hole of three-way joint

A cutter for cutting an intersecting line edge of an inner hole of a three-way connector comprises a rotating sleeve, an inserting and fixing rod and a countersink. The rotating sleeve is of a sleeve structure, a disc operation handle is arranged at the upper end of the sleeve, a center hole is formed in the disc operation handle, an inner hole of the sleeve is communicated with the center hole of the disc operation handle, and the inner hole of the sleeve is a special-shaped section hole and comprises a semicircular insertion fixing rod penetrating hole and a rectangular countersink penetrating hole which are combined together. A limiting boss is arranged at the upper end of the inserting and fixing rod, a profiling pin assembling hole matched with the cutter cutting track guiding mechanism is formed above the limiting boss, and the inserting and fixing rod is assembled in a semicircular inserting and fixing rod penetrating hole of the rotating sleeve. The countersink is a long-strip-shaped rod piece, the up