The invention discloses a servo lead screw feed cutting mechanism. The servo lead screw feed cutting mechanism comprises a cutting moving table and a clamping mechanism. The clamping mechanism comprises a clamp shaft and a clamping servo motor for driving the clamp shaft. The clamp shaft is hollow to form a clamping cavity; the clamping cavity is used for sleeving and clamping a to-be-cut part; a grinding wheel cutter is disposed in the position, corresponding to the clamp shaft, of the cutting moving table; a supporting table is disposed below the cutting moving table and provided with sliding ways; supporting columns are mounted between the cutting moving table and the supporting table; the top ends of the supporting columns are connected with the cutting moving table, and the bottom ends of the supporting columns are matched with the sliding ways so as to achieve sliding connection between the cutting moving table and the supporting table; a feed servo device is disposed at the end, far from the clamping mechanism, of the cutting moving table; the feed servo device comprises a feed servo motor and a controller electrically connected with the feed servo motor; a lead screw mechanism is disposed between the feed servo motor and the cutting moving table. The problem that the stability of a whole machine table is prone be affected by large drop of cams of existing cutting mechanisms is solved, and the machining efficiency is improved.