The invention relates to a high-temperature superconducting cable and a joint connecting method thereof, belongs to the technical field of high-temperature superconducting materials, and solves the problems of large size, high resistance, slow heat conduction, high processing difficulty and poor joint stability of the existing high-temperature superconducting cable joint. The joint connecting method comprises the following steps: 1, stacking and welding a plurality of high-temperature superconducting strips end to end in sequence to form a single-layer long strip; 2, stacking a plurality of single-layer long strips, wherein welding points of every two adjacent layers of single-layer long strips are arranged at intervals in the horizontal direction; 3, binding the plurality of stacked single-layer long strips into a high-temperature superconducting stack by using a binding piece. The invention also provides a high-temperature superconducting cable based on the joint connection method. The connector connecting method is simple in manufacturing process and easy in machining, and the cable connector manufactured through the connector connecting method is small in size, small in resistance, high in heat conduction speed and good in application prospect.