The invention provides a cutting and processing device for processing mechanical parts, which relates to the technical field of parts processing and includes: a main body seat, a fixing part, a mounting frame, a cutting part and a coating part; two sliding grooves are symmetrically opened on the main body seat A, and two sliding grooves B are symmetrically opened on the top surface of the main body seat; through the cooperative setting of the supporting claw and the sliding arm, the limit of the sliding arm can be realized, as follows: due to the left end surface of the sliding arm and the left supporting claw Contact, and when the sliding arm slides 50cm to the right, the right end surface of the sliding arm contacts the supporting claw on the right side, so that the sliding limit of the sliding arm can be realized through the supporting claw, which solves the problem that the clamping structure will cause excessive gap when used for a long time , affecting the clamping quality; the fixing bolts of the supporting claws are easy to loosen, and the supporting claws have a single function.