A fixing frame includes a base body and a turntable mechanism. The base body includes an annular wall, an accommodation structure and a push button. The accommodation structure has a first opening, a second opening and a third opening. The push button includes a pin, a pressing post, a positioning post, a retaining plate and a spring. The pin is penetrated through the first opening. The pressing post is penetrated through the second opening. The positioning post is penetrated through the third opening. The turntable mechanism includes plural fourth openings. When the pressing post is not depressed, the pin is inserted into one of the plural fourth opening, so that the turntable mechanism is fixed on the base body. After the pressing post is depressed and the pin is detached from the fourth opening, the turntable mechanism is rotatable relative to the base body.