A hydraulic power plant device polling method comprises the steps of: the step 1, making a polling plan on a three-dimensional information model server, and emitting a command to start a polling robot; the step 2, detecting the position of the polling robot; the step 3, detecting whether the dump energy of the polling robot meets a first condition or not, if no, allowing the polling robot to return a charging pile for charging, and returning to the step 1, and if yes, entering the next step; the step 4, detecting whether the polling robot has polling points or not in a first distance, if yes,executing a polling task, or else, entering the next step; the step 5, determining whether the polling robot has a barrier or not in a second distance, if yes, reporting errors to the three-dimensional information model server, terminating the polling plan and returning the polling robot to the charging pile nearby, or else, allowing the polling robot to travel for the second distance; and the step 6, determining whether the polling plan is finished or not, if yes, returning the polling robot to the charging pile, finishing the polling, or else, returning the step 2.