The invention provides an LD (laser diode) mono-tube light beam shaping module, comprising a rectangular heat sink, four semiconductor mono-tube alignment modules, a first glass shaping mirror, a second glass shaping mirror and a third glass shaping mirror. The top of the heat sink is provided with an opposite angle groove in the opposite angle direction; one side of the opposite angle groove is opened with the other one groove parallel with the opposite angle groove; two adjacent side walls of the opposite angle groove on the heat sink are respectively provided with two fixed screw holes; the four semiconductor mono-tube alignment modules are respectively fixed on the side walls of the heat sink with the screw holes; the first glass shaping mirror is inserted in the opposite angle grooveof the heat sink; the second glass shaping mirror is inserted in the opposite angle groove of the heat sink and has a preset distance with the first glass shaping mirror; and the third glass shaping mirror is inserted in the groove of the heat sink.