The invention discloses a jointed rock mass volume joint number determination method based on a drilling camera shooting technology, which is applied to the technical field of rock mass integrity evaluation, and comprises the following steps of S1, selecting a surface area per unit area on the surface of a rock mass to be measured, S2, measuring the rock mass surface joint number Js, the joint distance H and the inclination angle theta between the joint and the horizontal roadway of the surface area of the unit area, S3, drilling holes in the surface area of the unit area, and measuring the number Jc of joints in the rock mass, and S4, comparing the joint distanceH measured in the step S2 with a sine value and a cosine value of the joint inclination angle theta, and determining the rock mass volume joint number Jv. According to the method, the volume joint Jv is calculated by comprehensively considering the internal joint Jc and the surface joint Js, the considered factors are more comprehensive, and the calculation is more accurate and faster.