The utility model relates to the technical field of multiple-joint staged fracturing in a horizontal well section, in particular to a multiple-joint staged fracturing temporary plugging agent ground input device in a horizontal well section. The multiple-joint staged fracturing temporary plugging agent ground input device in the horizontal well section comprises a barrel body, wherein one end of the barrel body is provided with an inlet for being communicated with a high-pressure pipe manifold outlet, the other end of the barrel body is provided with an outlet communicated with a fracturing liquid ground flowing high-pressure pipeline, a first switch valve is arranged on the barrel body, a branch pipe is further arranged on the barrel body, and two ports of the branch pipe are communicated with the barrel body and located on two sides of the first switch valve. The branch pipe is provided with a second switch valve and a third switch valve, a temporary plugging agent input pipe is arranged on the branch pipe, an outlet of the temporary plugging agent input pipe is communicated with the branch pipe and located between the second switch valve and the third switch valve, and a fourth switch valve is arranged on the temporary plugging agent input pipe. By adopting the multiple-joint staged fracturing temporary plugging agent ground input device, a temporary plugging agent can be input into the well without pump shutdown, an input process is simplified, and the temporary plugging agent waste is avoided.