The invention discloses an adjustable dual-twisting mirror box for measuring an apparent parameter of a yarn and a device of the box. The adjustable dual-twisting mirror box is in a hollow semi-cylinder closed structure and comprises a diffuse reflection arc shield plate and semicircular fixed plates, wherein the diffuse reflection arc shield plate forms an arc surface of a semi-cylinder, the two fixed plates respectively form two end faces of the semi-cylinder, through holes are formed in symmetric shafts of the fixed plates, a connecting line of the two through holes forms a symmetric axis of a yarn channel fixing plate to form a symmetric plane, twisting mirrors and an LED (Light Emitting Diode) light source are arranged at two sides of the symmetric plane by adopting a mirror symmetry structure, a lens is arranged on the symmetric plane, a monocular CCD (Charge Coupled Device) camera is arranged behind the lens and connected with the lens, the twisting mirrors are arranged at one side close to the diffuse reflection arc shield plate, the LED light source is arranged at one side far away from the diffuse reflection arc shield plate, the twisting mirrors, the LED light source and the lens are arranged on the same plane, and a yarn channel penetrates through a space formed by the twisting mirrors and the LED light source, and thus the comprehensive analysis for the three-dimensional apparent characteristic of the yarn can be realized by one monocular CCD camera.