The invention discloses a novel machining, positioning and pressing device. The device comprises a cross-shaped base composed of four bottom plates and four pressing mechanisms, the four pressing mechanisms are respectively arranged on the four bottom plates of the cross-shaped base, and each pressing mechanism comprises a fixing plate, an adjusting bolt and a pressing plate. Each fixing plate isfixedly connected to the end of the corresponding bottom plate, each adjusting bolt is in threaded connection with the corresponding fixing plate, and the end of each adjusting bolt points to the center of the cross-shaped base. The end of each adjusting bolt is connected with one end of the corresponding pressing plate, the sliding blocks are arranged at the bottoms of the pressing plates, the sliding grooves are formed at the positions, corresponding to the sliding blocks, of the bottom plates, and the pressing plates are in sliding connection with the corresponding bottom plates through thesliding blocks and the sliding grooves. The novel machining, positioning and pressing device is simple and reasonable in structure, ingenious in design and novel in conception, is easy to produce andmanufacture and is capable of effectively fastening a workpiece, a machined object does not break, and the economic losses are avoided.