The invention belongs to the technical field of road detection and relates to a portable geological radar urban road detection vehicle. The portable geological radar urban road detection vehicle comprises a main body push rod, a supporting travelling mechanism, a handle tray mechanism and a control unit fixing mechanism. The main body push rod is a telescopic push rod, three connecting rotary shafts are arranged on the rod, located at the two ends of the main body push rod and the lower-middle position of the main body push rod correspondingly, and sequentially connect the handle tray mechanism, a radar antenna and the supporting travelling mechanism, and the parts can rotate around the rotary shafts correspondingly. A main body of the supporting travelling mechanism is a triangular supporting frame, and the three corners are sequentially connected with a guide rod and two rolling wheels. The handle tray mechanism is used for controlling the detection vehicle and holding a radar main machine. The control unit fixing mechanism fixes a control unit to the waist of the main body push rod. The problem that the requirements for the detection efficiency and flexibility cannot be met simultaneously through existing geological radar road detection methods is solved; and the detection vehicle is convenient to carry due to the characteristic that the detection vehicle is a herringbone cart during operation and is a straight-line-shaped trailer when not in use, flexible in road detection operation and high in efficiency.