The invention discloses a brush roll suspension arm for a solar photovoltaic cell panel cleaning vehicle. The brush roll suspension arm comprises a front arm and a rear arm which are hinged; an elastic connecting device is arranged between the front arm and the rear arm; the elastic connecting device comprises a pull bar, a compression spring, a first connecting piece and a second connecting piece, wherein the compression spring is arranged on the pull bar in a sleeving manner; the pull bar is provided with a first end and a second end; the first end of the pull bar is connected with the first connecting piece; the second end of the pull rod is used for clamping and pressing the compression spring onto the second connecting piece. In case of jolting downwards in a bumpy road surface, a brush roll is greatly stressed, and as the elastic connecting device balances the weight of the brush roll and the weight of a brush roll frame, a front arm is jacked up instantaneously, without crashing a cell panel cause by no enough time for response. The brush roll suspension arm disclosed by the invention is simple in structure, and relatively safe and reliable to use, and the road surface adaptability is greatly improved.