The invention relates to a staggered tooth milling cutter for T-shaped groove machining, belongs to the field of machining, and particularly belongs to the field of machining tools for T-shaped grooves of micro parts. The staggered tooth milling cutter a handle part, a milling tooth part and a T-shaped blade part which are connected through the same axis; the T-shaped blade part and the milling tooth part are the same in cutting direction; the T-shaped blade part comprises a plurality of T-shaped blades; the milling tooth part comprises at least two spiral milling teeth; the T-shaped blades are arranged on the milling teeth and extends out of the milling tooth part in the radial direction, and at least two T-shaped blades are distributed on the different milling teeth, so that the distancebetween the two T-shaped blades along the axis of the milling tooth part is smaller than 1 mm. According to the scheme, the design that the T-shaped blades are arranged in a staggered mode is adopted, the problem that when the distance between the adjacent T-shaped blades is smaller than 1 mm, the T-shaped blades cannot be machined by a grinding wheel can be effectively solved, the stagger toothstructure is adopted, the staggered tooth milling cutter can serve as a milling cutter and can be used for forming of continuous T-shaped grooves, and the groove interval error caused by repeated grooving is reduced; and the manufacturing efficiency of continuous T-shaped grooves is effectively improved.