The invention belongs to the field of high-pressure hydrostatic testing machine equipment, and relates to a pipe fitting clamping and discharging device for a multi-pipe high-pressure hydrostatic testing machine. The pipe fitting clamping and discharging device comprises a rack, wherein the rack is provided with a movable clamping mechanism and a discharging mechanism; the clamping mechanism is mounted at a position I on the rack; the discharging mechanism is mounted on the rack and at a position II corresponding to the position of the clamping mechanism; the clamping mechanism and the discharging mechanism are mutually matched. Each of the clamping device and the discharging device for a plurality of pipelines only needs to be driven by an oil cylinder, so that the structure of a system is greatly simplified; the pipe fitting clamping and discharging device is convenient to manufacture and maintain, is simple in structure and is low in cost.