徐工QY20K5起重机具有以下优点：1. 高承载能力：徐工QY20K5起重机具有20吨的起重能力，能够应对大部分起重作业需求。2. 卓越的安全性能：徐工QY20K5起重机配备有完善的安全保护装置，如超重、超载、超高、超限等多种保护装置，确保施工过程中的安全可靠。3. 灵活性强：徐工QY20K5起重机可360度旋转，配备多段式折叠臂，能够在狭小的工作空间内完成复杂的起重作业，提高施工效率。4. 操控简便：徐工QY20K5起重机采用液压驱动，配备操作平台，操作简单便捷，可以迅速熟悉操作技巧。5. 低运输成本：徐工QY20K5起重机整机重量较轻，容易 进行拆装和运输，降低运输成本。6. 低能耗：徐工QY20K5起重机采用先进的液压系统和电控系统，具有低能耗的特点，节能环保。7. 可靠性强：徐工QY20K5起重机采用高强度钢材制造，结构牢固，具有良好的承载性能和稳定性，能够适应各种复杂环境的作业需求。总之，徐工QY20K5起重机具有高起重能力、安全可靠、灵活性强、操控简便等优点，适用于各种工地起重作业需求。

XCMG QY20K5 crane has the following advantages: 1. high load capacity: XCMG QY20K5 crane has a lifting capacity of 20 tons, which can cope with most of the lifting needs. 2. excellent safety performance: XCMG QY20K5 crane is equipped with perfect safety protection devices, such as overweight, overload, overheight, over the limit, and other protective devices, to ensure that construction is safe and reliable. 3. flexible: XCMG QY20K5 crane can be rotated 360 degrees, equipped with multi-section folding jib to complete complex lifting operations in a narrow workspace, and improve the efficiency of the work. 4. Strong flexibility: XCMG QY20K5 crane can be rotated 360 degrees, equipped with multi-segment folding jib, able to complete complex lifting operations in a small workspace, improve construction efficiency.4. Simple operation: XCMG QY20K5 crane is hydraulically driven, equipped with an operating platform, easy and convenient to operate, and you can quickly familiarize yourself with operating skills.5. Low transportation costs: XCMG QY20K5 crane is lightweight and easy to operate. Crane weight is light, easy to disassemble and transport, reduce transportation costs. 6. low energy consumption: XCMG QY20K5 crane adopts advanced hydraulic system and electronic control system, with low energy consumption, energy saving and environmental protection. 7. strong reliability: XCMG QY20K5 crane is made of high-strength steel, solid structure, good load-bearing performance and stability, and can adapt to a variety of complex environments. It can adapt to the operational needs of various complex environments. In short, XCMG QY20K5 crane has the advantages of high lifting capacity, safety and reliability, flexibility, easy to maneuver, etc., applicable to a variety of site lifting needs.