The invention discloses an object volume measuring system and method. The object volume measuring system comprises a conveyor belt, image acquisition equipment, image processing equipment and a line laser; the image acquisition equipment is used for collecting first pictures including pictures of laser rays emitted by the line laser on the conveyor belt at a set time interval, and sending each collected first picture to the image processing equipment; the image processing equipment is used for receiving each first picture, adopting a triangulation telemetry method to determine the first heightof an object in each first picture according to second pictures which are stored in advance and collected by the image acquisition equipment when objects do not exist on the on the conveyor belt yet,and determining a target height of the object according to the first height of the object in each first picture; determining the volume of the object according to the target height of the object andat least one first picture corresponding to the target height of the object. The object volume measuring system and method are used for solving the problem in the prior art that the measured volume ofthe object is inaccurate when the height of the object is not accurately measured.