The invention relates to the field of bridge detection, and discloses a concrete box girder inspection robot. The concrete box girder inspection robot comprises a carrying trolley which comprises a housing, a walking mechanism and four shock-absorbing mechanisms, and the housing and the walking mechanism are connected through the four shock-absorbing mechanisms. An image acquisition device is alsoprovided and is arranged on the housing. At least one flaw detection device is further included and includes a folding arm and a matrix radar, one end of the folding arm is rotatably connected to thehousing, the other end of the folding arm is rotatably connected to the matrix radar, and the matrix radar is used for closely fitting the wall of the space inside a concrete box beam for conductingdetection. The concrete box girder inspection robot can effectively solve the problems of low efficiency and inaccuracy caused by the fact that in the prior art, a folding tool needs to be used for detecting a bridge on the bridge surface and manual work needs to be used in cooperation for visual inspection inside a steel box girder.