The invention discloses a solid amalgam Hg-injectiing device for producing fluorescent lamp, including a base and a Hg-storing hopper, which is characterized in that setting a bottom plate and hopperinstallation plate on the base fixedly, the hopper installation plate is provided with axis hole, the bottom plate is provided with mean axis which is sleeved with handsetting gear, the Hg-storing hopper passes through the axis hole to socket on the mean axis and is connected with the handsetting gear, the underside of the Hg-storing hopper is arranged with a lap of small holes to receive a solidamalgam, the hopper installation plate is arranged with a leaking hole relative to each small holes, the leaking hole is provided with Hg openning, the number of the small holes is integer times of the gear number of the handsetting gear which is arranged with handsetting mechanism. The Hg-storing hopper is driven to rotate by the rotation of the handsetting gear, so that the solid amalgam withinthe small holes is put in the leaking-hole on the hopper installation plate in order, then the the solid amalgam is injected into Hg-gun through the Hg opening.