The invention relates to a device and a method for measurement, in particular to a device and a method for contactless measurement of the contour dimension of an insulator. The device for contactless measurement of the contour dimension of the insulator is characterized by comprising a base provided with a plurality of rollers, an automatic electromechanical controller (3), a driving component, a measurement component and a computer system (4), wherein the driving component is arranged on the automatic electromechanical controller (3) which is arranged on the base, the measurement component is connected with the driving component, and the computer system (4) arranged on the base is used for controlling the automatic electromechanical controller (3) and the driving component and receiving information of the measurement component. Therefore, the device and the method have the advantages that images of the insulator can be obtained remotely without contacting with the insulator, and reconstruction and measurement of a three-dimensional structure of the insulator are achieved.