1. A method for detecting a location of a laser point on a screen, wherein the method is applied to a screen projection system, wherein the screen projection system comprises a screen and N cameras, wherein the screen comprises N screen areas, wherein the N cameras are used to capture images in the N screen areas, wherein the screen areas correspond to the cameras in a one-to-one manner, wherein N is a positive integer greater than 1, and wherein the method comprises: acquiring a first image frame captured by a first camera among the N cameras; detecting whether a first laser point exists in the first image frame; using the first laser point as a laser point on the screen when the first laser point exists in the first image frame, and no laser point exists in an image frame captured by another camera except the first camera among the N cameras; and acquiring information about a location of the first laser point on the screen.