The invention discloses a method for measuring and controlling a water accumulating volume of a coal mine goaf. The water accumulating trend length L of the goaf and a coal bed pitch alpha are measured; water accumulating water head heights H1 and H2 and a lower crossheading roadway width D are measured; a water accumulating space of the goaf is seen as a triangular pyramid model, and then a water accumulating total Q of the goaf is obtained according to the equation that Q= + water accumulating amount of a tunneling roadway. The water accumulating amount of the tunneling roadway is fully considered; through the comparison between the measurement water release amount and the actual water release amount, the measurement and controlling method conforms to lithology combination characteristics of a Xieqiao mine 13-1 coal bed roof, has good guiding effects on water accumulating amount prediction of the mine 13-1 coal bed goaf, and can greatly improve mine safety and guarantee efficient production.