The invention provides a hardware cutting machine convenient to fix, comprising a supporting column, a supporting plate, a cutting knife, and a protective cover, and further comprising an electromagnetic suction cup, a transverse guide rail, a vertical guide rail, a longitudinal guide rail, and a remote control system. The supporting column can be driven for a rotational movement. The supporting plate is horizontally disposed on the supporting column, and the electromagnetic suction cup is fixedly disposed in a center position of an upper surface of the supporting plate. The longitudinal guiderail is horizontally disposed on one of four vertical faces inside the protective cover. One end of the transverse guide rail is disposed on the longitudinal guide rail in a sliding connection manner, and the transverse guide rail and the longitudinal guide rail are perpendicular to each other. The vertical guide rail is disposed on the transverse guide rail and can move along the transverse guide rail. The cutting knife is disposed on the vertical guide rail through a connecting rod, and can rotate around the connecting rod and move up and down along the vertical guide rail. According to thehardware cutting machine convenient to fix, adjustment of the cutting knife in three dimensions can be achieved, cutting is smoother, and the remote control system is also added, so that workers canremotely operate, the precision is higher, the effect is better, and the damage to the human body is reduced.