Forest pests and diseases is very important to forest because it not only restricts the development of forest, but also causes huge economic. Chemical pesticides control the pests and diseases effectively and pollute environment seriously. How to reduce the amount of pesticide is the research hotspot in the field of plant protection. Forest plant protection machinery is the most important way to spray chemical pesticides. With the development of various modern information technologies, forest plant protection machinery has entered the electronic age in developed country. There are many modern information technologies which are applied in forest plant protection machinery, such as database, 3S technology, and sensor technology and so on. In this paper, a large number of relevant scientific literatures have been analyzed and compared in order to summarize application of modern information technology in the forest plant protection machinery. As the wide forest range, forest plant protection machinery should base mainly on large-scale spraying. 3S technologies, database technology, computer control technology and a variety of detection techniques should be effectively combined together and applied in forest plant protection machinery in order to meet environmental safety requirements and improve the efficiency.