徐工QY70K5D-1起重机具有以下优点：1. 高起重能力：该起重机的最大起重能力为70吨，能够应对较大的起重任务。2. 良好的稳定性：起重机配备有稳定的四点支撑系统，保证了机身在起重过程中的稳定性和安全性。3. 高效的工作性能：起重机配备有先进的液压系统和操作控制系统，使其具有快速、精确和高效的工作性能。4. 高强度和轻量化设计：起重机的结构采用高强度钢材制造，同时通过轻量化设计，提高了机身的强度和刚性，并降低了整机的自重。5. 灵活的机动性：起重机采用了自行驱动的设计，可以快速移动到工作地点，并具有较小的转弯半径，适应不同场地的工作要求。6. 全方位视野和安全性：起重机配备有宽大的驾驶室，提供全方位的视野，操作员可以更好地掌握工作情况。此外，起重机还配备了多重安全装置，确保操作过程的安全性。总体而言，徐工QY70K5D-1起重机具有高起重能力、稳定性强、工作效率高以及方便安全等优点，适用于各种起重工作场景。

XCMG QY70K5D-1 crane has the following advantages:1. High lifting capacity: the crane has a maximum lifting capacity of 70 tons, which is able to cope with larger lifting tasks.2. Good stability: the crane is equipped with a stable four-point support system, which ensures the stability and safety of the fuselage during the lifting process.3. High-efficiency working performance: the crane is equipped with an advanced hydraulic system and operating control system, which gives it fast, precise and efficient working performance.4. High strength and lightweight design: the structure of the crane is made of high-strength steel, and at the same time, through the lightweight design, it improves the strength and rigidity of the body and reduces the deadweight of the whole machine.5. Flexible mobility: the crane adopts a self-propelled design, which allows it to be moved to the workplace quickly and has a small turning radius to Adapt to the working requirements of different sites.6. Omni-directional vision and safety: the crane is equipped with a wide cab, providing omni-directional vision, so that the operator can have a better grasp of the working situation. In addition, the crane is equipped with multiple safety devices to ensure the safety of the operation process. Overall, XCMG QY70K5D-1 crane has the advantages of high lifting capacity, strong stability, high working efficiency and convenience and safety, which is suitable for all kinds of lifting work scenarios.