3D reconstruction of agriculture and forestry crops plays an important role in the studies on the biological characteristics of the crop, canopy light distribution and agricultural robot applications. Structures of crops are complex. Fast and accurate three-dimensional reconstruction of the crop is a challenging task. Crop 3D reconstruction methods have caused extensive concerns in the relevant field of study. This paper reviewed the methods of 3D reconstruction of agriculture and forestry crops. According to the technology and core device used, those methods are divided into four categories, rule-based method, image-based method, scan-based method and method based on 3D digitizer. According to this classification, the hardware of the various methods and applications in agriculture and forestry crop 3D reconstructions were summarized and described and the advantages and disadvantages of different methods were analyzed and compared. Finally, the development trend of the crop reconstruction was discussed. 