The invention relates to a driving type pavement trenching machine which comprises a self-walking device and a trenching device, wherein two lifting arms on the self-walking device are connected with a rack; the trenching device comprises a rack, a cutter disc rack and a milling mechanism; a working cylinder is hinged to the lifting arms and the rack; a transverse adjusting cylinder and a guide column are mounted on the rack; the cutter disc rack comprises a connecting main body and a semi-circular cutter cover; the guide sleeve on the connecting main body sleeves the guide column; the milling mechanism is mounted on the cutter cover; scrap outlet holes are formed in a left side plate and a right side plate on one scrap outlet side of the cutter cover; scrap guide tubes are arranged at the scrap outlet holes of the left side plate and the right side plate; a disc-shaped cutter disc of the milling mechanism is mounted on a hydraulic motor; milling cutters comprise at least four arc-shaped cutter bases which are mounted on the cutter disc through fasteners and at least three milling heads fixed on the arc-shaped cutter bases. The driving type pavement trenching machine has the characteristics that the structure is simple, a pavement structure is not damaged when an optical cable groove is trenched, the working efficiency is high, and the depth of the trench and the trenching positions can be conveniently adjusted.