The invention relates to the field of dust fall in a construction site, in particular to a fence construction method and a fence module with a self-test type spraying device for a pipe. The fence module includes at least a fence plate, fence columns and spraying pipes, the spraying pipes are hose and/or hard pipe, one or above connecting pipe is arranged in the middle of the pipe walls of the spraying pipes, and an electromagnetic valve is arranged on the connecting pipes; quick joints are arranged at both ends of the spraying pipes, the fence columns are connected with two ends of the fence plate, grooves are formed in the fence plate and the upper ends of the fence columns, the sizes of the grooves are matched with the sizes of the spraying pipes, dust sensors are arranged on the pipe walls of the spraying pipes, the spraying pipes are connected with each other to form a spraying pipeline, and a pressure sensor is installed on the spraying pipeline. The flying dust situation in the vicinity of a fence is monitored in real time by the dust sensors in the technical scheme, and dust fall can be targeted to the area requiring to be sprayed; the pressure of the spraying pipeline is monitored by the pressure sensor, when it is detected that the pressure of the spraying pipe is not within the range of normal pressure values, an intelligent terminal will have abnormal prompts, and alarms are issued by an alarm device.