Machining method for multi-surface cavity

The invention discloses a machining method for a multi-surface cavity. The machining method comprises following machining steps that (a), according to the requirement, the front surface of a semi-finished product part is machined, and a T-shaped knife is used for machining a semi-finished product part through hole; (b), according to the requirement, the back surface of the semi-finished product part is machined, and a primarily-machined part is obtained; (c), a first tool and a second tool are machined; (d), the first tool and the second tool clamp the primarily-machined part, and an ejection pin is ejected into a positioning hole of the second tool; and (e), a left side face machining program, a right side face machining program, a front side face machining program and a rear side face machining program are sequentially arranged in an XYZA four-axis linkage machining center, and the XYZA four-axis linkage machining center is started to execute the machining programs on the primarily-machined part, and the multi-surface cavity is obtained. The machining method for the multi-surface cavity can machine the multi-surface cavity more rapidly and precisely, and labor intensity of workers can be relieved.