The invention relates to the technical field of Internet mobile application, and especially to a state spot-check and maintenance monitoring system and method of mobile machinery. The system comprises ACC control units, a GPS positioning system, a background monitoring system and a mobile phone terminal, wherein the ACC control units are mounted on different mobile machinery devices, the GPS positioning system and the background monitoring system communicate with the ACC control units, the mobile phone terminal communicates with the GPS positioning system, and the background monitoring system communicates with both the GPS positioning system and the mobile phone terminal. The monitoring system can be used to master the operation state of single mobile machinery device via spot check and maintenance, receive advanced notification and prompt information of spot check and maintenance, maintain the corresponding device timely, ensure that spot check and maintenance are carried out smoothly within prescribed time, avoid low working efficiency and insufficient management caused by continuous work of the devices and untimely spot check and maintenance, achieve standard device management, reduce the device cost, and improve the utilization rate of the devices.