Detachable plasma cutting machine beam part: adopts Taiwan imported double-axis guide rail, and is equipped with dust cover protection. The plasma height-adjusting body is made of aluminum alloy structure to reduce the load of the beam, and the height-adjusting shaft is a high-carbon steel rod, which has high hardness and wear resistance. The plasma supporting interface is equipped with a plasma anti-collision device to provide safety protection for the plasma cutting gun. At the same time, it is equipped with a plasma cutting water spray device, which can spray water to the cutting point in real time during cutting, which can improve the cutting effect and reduce thermal deformation.