This chapter systematically introduces the essential equipment used in waste pretreatment processes. Firstly, it provides an overview of waste pretreatment, emphasizing its role in facilitating downstream waste management. Secondly, the chapter explores various weight measuring devices, detailing their classification, structure, operational principles, features, development trends, and representative industry models. Thirdly, it examines bag-breaking equipment, focusing on its overview, current advancements, and common industry solutions. Fourthly, waste sorting systems are discussed in terms of classification and typical applications utilized in the field. Finally, the chapter reviews waste crushing equipment, summarizing its introduction, recent development, and leading industry models. Through these thematic sections, the chapter offers a practical foundation for professionals aiming to enhance the efficiency and effectiveness of waste pretreatment operations.