The invention provides a photovoltaic module having a groove structure and a preparation method thereof. The photovoltaic module consists sequentially from bottom to top of a metal backboard, an insulating layer, a conducting circuit layer, a plurality of back contact solar cells, a packaging adhesive and a glass cover plate. The metal backboard includes a plurality of grooves in array distribution. The insulating layer covers the upper surface of the metal backboard and the sides and bottoms of the grooves. The conducting circuit layer is located on the insulating layer and electrically connected with the plurality of back contact solar cells. Each groove accommodates one or more back contact solar cells. According to the invention, the back contact solar cells are arranged in the grooves in the metal backboard so that the back contact solar cells can transfer the heat generated in the photoelectric conversion to the outside directly through the metal backboard, the heat dissipating performance of the solar cell module is improved, and the service life of the solar cell module is further prolonged.