Lignin nanoparticles are abundant, nontoxic, inexpensive, environmentally friendly, biodegradable, and biocompatible, in addition to having antioxidant, antibacterial, and UV-absorbing properties—they are capable of getting priority for the depth study in functional composite manufacturing field. Lignin is a very versatile type of polymer widely used in structural composites, and it has also shown potential in various applications such as sensors, packaging materials, and energy storage systems. High-value chemical compounds are needed for the implementation of an automated pulping and purifying strategy. The current chapter will overview a comparative scenario of the existing literature on several lignin solvent pulping methods. The most relevant findings regarding lignin conventional and modern solvent methods have been summarized and analyzed in this chapter. In addition, this writing will summarize the main characteristics of lignin, lignin extraction process classification, and lignin solvent method (i.e., organic solvent, ionic liquid solvent, liquid ammonia solvent), and potential future research areas are also highlighted.