The present invention relates to a support structure for an optical time domain reflectometer and an optical time domain reflectometer containing such structure comprises a rear housing and a support portion, among which, the support portion comprises a cover support plate and an inner support plate; the cover support plate is connected to the rear housing through a cover rotating shaft portion, and the inner support plate is connected to the cover support plate through an inner plate rotating shaft portion; the surface area of the inner support plate is smaller than that of the cover support plate. The invention can solve the shortcoming of the instability of the support of existing optical time domain reflectometers, and provide a support structure for an optical time domain reflectometer having low cost, stable structure, and that can automatically open the support, as well as an optical time domain reflectometer used with this support structure.