The invention discloses a linear motor feeding and cutting mechanism which comprises a cutting movable table, a clamping mechanism and a linear motor, wherein the clamping mechanism comprises a clamp shaft and a clamping servo motor for driving the clamp shaft; the clamp shaft is arranged in a hollow mode so as to form a clamping cavity; the clamping cavity is used for casing and clamping a to-be-cut part; a position, corresponding to the clamp shaft, on the cutting movable table is provided with a grinding wheel knife; a supporting table is arranged below the cutting movable table; a slide rail is arranged on the supporting table; a supporting post is arranged between the cutting movable table and the supporting table; the top end of the supporting post is connected with the cutting movable table; the bottom end of the supporting post is matched with the slide rail for realizing sliding connection between the cutting movable table and the supporting table; the linear motor comprises a controller and a primary stage and a secondary stage which are coupled with each other; one of the primary stage and the secondary stage is connected with the bottom of the cutting movable table; and the other one of the primary stage and the secondary stage is connected with the supporting table; and the controller is used for controlling the primary stage and the secondary stage to move oppositely. The linear motor feeding and cutting mechanism solves the technical problems that a conventional cutting mechanism is low in cutting speed, low in precision and short in service life.