The invention discloses a video camera space coverage area acquisition method for a simple monitoring object. The video camera space coverage area acquisition method comprises the following steps: importing a three-dimensional physical model in a monitored area, and determining the installation site of a video camera; in a three-dimensional space coordinate system, determining six surfaces of a visual cone body according to the installation site of the video camera so as to obtain the irradiation range of the video camera; obtaining all points in the irradiation range of the video camera on the surface of the simple monitoring object; classifying the points in S3 on the plane of the simple monitoring object, wherein each type of points forms one set; converting all the points in one set into two-dimensional coordinate points on the same plane, and obtaining a convex hull formed by the two-dimensional coordinate points on the plane; obtaining the convex hulls corresponding to all the sets; obtaining the space average area of the video camera on the simple monitoring object according to the convex hulls. Through the adoption of the method, the space average area of the video camera for the simple monitoring object can be accurately obtained.