The present invention provides a mining inclinometer which comprises the following components: an inclination angle detection module, a processing module, a first interface module and a second interface module. The inclination angle detection module is used for detecting inclination angle information of a detected object. The processing module is used for processing the inclination angle information of the processing module and a data frame signal which is received from the inclinometer or a hydraulic bracket controller, and generating another data frame signal. The first interface module is used for transmitting or receiving the data frame signal of an adjacent inclinometer or the hydraulic bracket controller and communicating with the processing module. The second interface module is used for communicating with the processing module and transmitting/receiving the data frame signal of the adjacent inclinometer. The present invention also provides a bracket inclination angle measuringsystem which is composed of the mining inclinometers and a corresponding measuring method. Through the mining inclinometer, interface occupation of the bracket controller can be reduced and power consumption can be reduced.