Cutter bit for cutter suction device

The utility model discloses a cutter bit for a cutter suction device, which comprises a cutter ring, a shaft hub and a plurality of cutter arms, the cutter arms are connected with the cutter ring and the shaft hub, cutter tooth assembly fixing parts are arranged on the cutter arms, cutter tooth assemblies comprise cutter tooth seats and cutter teeth, the cutter tooth seats are fixed on the cutter tooth assembly fixing parts, and the cutter teeth are fixed on the cutter tooth assembly fixing parts. The lower end of the cutter tooth seat is provided with a clamping groove clamped on the fixing portion of the cutter tooth assembly, the top of the cutter tooth seat is provided with an inserting portion, the inserting portion comprises side edge inserting plates and a positioning arc concave groove, two locking blocks are arranged between the two side edge inserting plates, and the cutter teeth are provided with inserting grooves allowing the inserting portion to be inserted. Locking holes allowing the locking blo