The invention discloses a lifting and slewing cycle index detecting system and method for an automobile crane boom, relating to the technical field of operation reliability detection of automobile cranes. The system comprises a weight lifting height detecting device adopting a wireless detecting mode, a relay module used for erecting a wireless data transmission bridge between the weight lifting height detecting device and a processing unit, a boom 180-degree left-and-right slewing number detecting device used for transmitting the time to the processing unit in a wireless manner, main and auxiliary wireless unvarnished data transmission modules used for creating a transmission channel, a merging data processing unit and a display unit. The detecting method comprises the steps that: the processing unit automatically judges the lifting and slewing cycle time of the boom according to the heavy lifting height and the 180-degree left-and-right slewing number of the boom. The detecting system and method disclosed by the invention are used for automatically detecting the lifting and slewing cycle number of the boom, thereby replacing the manual monitoring and recording manner, reducing the working strength of an inspector, improving the accuracy and the efficiency of reliable tests and reinforcing the safety of a crane operator and the slewing uniformity for each time.