Custom machining device for door and window components

The invention discloses a door and window component custom machining device which comprises a cutting knife, a driven rotating unit and a driven rotating unit, the top end of the cutting knife is connected with a rotating roller, the rotating roller is used for changing the cutting angle of the cutting knife, the driven rotating unit comprises a sleeve and a positioning round rod, and a sawtooth-shaped annular groove is formed in the outer wall of the rotating roller; the outer side of the rotating roller is sleeved with a sleeve, a positioning round rod is arranged on the inner wall of the sleeve, the positioning round rod is installed in the sawtooth-shaped annular groove in a sliding fit mode, the sleeve is driven to change the cutting angle of the cutting knife through the rotating roller, and the door and window profile is subjected to 45-degree cutting operation through the cutting knife. When the door and window sectional material is continuously cut, the cutting angle of the cutting knife needs to be