The utility model belongs to the field of high-pressure hydrostatic testing machines and discloses a pipe clamping and discharging device for a multi-pipe high-pressure hydrostatic testing machine. The device comprises a rack, wherein a movable clamping mechanism and a movable discharging mechanism are mounted on the rack; the clamping mechanism is mounted in a first position of the rack, and the discharging mechanism is mounted in a second position, corresponding to the clamping mechanism, of the rack; the clamping mechanism and the discharging mechanism are matched with each other. Each of the clamping mechanism and the discharging mechanism for multiple pipes is driven by one oil cylinder, so that the system structure is simplified greatly, and the device is convenient to manufacture and maintain, simple in structure and low in cost.