This chapter provides a comprehensive overview of street washing trucks, covering their features, types, applications, and development trends. Firstly, it introduces the main characteristics, varieties, and future directions of street washing truck technology. Secondly, the chapter examines the fundamentals of design, including key parameter determination, chassis selection, powertrain design, and performance optimization. Thirdly, it outlines the major components and parameters of street washing trucks, focusing on general layout, water systems, hydraulic and pneumatic systems, and control systems. Fourthly, technical specifications and performance testing procedures are discussed, with reference to inspection checklists to ensure operational standards. Finally, the chapter presents essential criteria for selecting street washing trucks, supported by main technical parameters to aid in informed decision-making.