The invention provides a method and a system for detecting and controlling stockpiling, wherein the method comprises the following steps of: carrying out laser scanning to a stockpile and a stock flow ejected out of a stock ejecting roller of a stockpiling machine by using a laser scanner; collecting scanning data in real time; reading the state data of a PLC (Programmable Logic Controller) in real time from the PLC for controlling the stockpiling machine; decoding the scanning data and establishing a space coordinate relating to the points of the stockpile and the stock flow ejected out of the stock ejecting roller of the stockpiling machine by combining with the state data of the PLC; separating the contours of the stockpile and the stock flow ejected out of the stock ejecting roller of the stockpiling machine in the space coordinate; distinguishing the wave peak of the stockpile by utilizing the contour of the stockpile; calculating the distance between the stock ejecting roller on a large arm of the stockpiling machine and the wave peak of the stockpile, and transmitting a control instruction on the stockpiling machine to the PLC according to a calculating result; and operating the stockpiling machine by using the PLC according to the received control instruction. The method and the system provided in the invention can be used for accurately judging the distance between the large arm of the stockpiling machine and the stockpile in real time and realize the full-automatic stockpiling operation of the stockpiling machine.