The invention discloses a multifunctional clamp for mechanical manufacturing. The multifunctional clamp comprises a mounting plate, wherein a connecting plate is arranged on the upper surface of the mounting plate, and a rotating disc is arranged on the upper surface of the connecting plate; a bearing is arranged in the middle part of the lower surface of the rotating disc, and the rotating disc is rotationally connected with the connecting plate through the bearing; two first fixing plates are arranged on the upper surface of the rotating disc, and the two first fixing plates are symmetrically arranged; the upper surface of the rotating disc is provided with a second sliding groove, and the second sliding groove is positioned in the middle part between the two first fixing plates; the upper surface of the rotating disc is provided with a third fixing plate, and the third fixing plate and the second sliding groove are in equal-angle distribution; and a sliding block is arranged on thelower surface of the third fixing plate, and the sliding block is arranged in the middle part of the second sliding groove. The multifunctional clamp for mechanical manufacturing has the advantages ofbeing convenient to assemble and disassemble, firm in structure, stable and durable, convenience is brought to installation and use, multiple mechanical parts can be clamped, the anti-skid capacity is increased, operation is simple, the working efficiency is improved, and manufacturing cost is reduced.