The invention provides a powder conveying drive including: a powder suction conduit (2) and a powder suction valve (5); a powder discharge conduit (3) and a powder discharge valve (6); a pump body (1) comprising a transfer chamber (13) that is configured with a powder inlet (11) connected to the powder suction conduit (2) and a powder outlet (12) connected the powder discharge conduit (3); and a powder sucking plunger (4) configured in upper part of the transfer chamber (13) and movable up and down inside the transfer chamber (13). When the powder sucking plunger (4) moves upward, the powder suction conduit (2) is opened by the powder suction valve (5) and the powder discharge conduit (3) is closed by the powder discharge valve (6) so that the powder is sucked into the transfer chamber (13) through the powder suction conduit (2). When the powder sucking plunger (4) moves downward, the powder suction conduit (2) is closed by the powder suction valve (5) and the powder discharge conduit (3) is opened by the powder discharge valve (6) so that the powder is discharged from the transfer chamber (15) through the powder discharge conduit (3). The powder inlet (11) is configured in the inner sidewall (130) of the transfer chamber (13), and the powder inlet (11) is above the powder outlet (12). Due to the powder discharge valve (6) is capable of overlapping the discharge of powder from the two transfer chambers (13) wherein the bottom wall (131) of the transfer chamber (13) is a porous fluidized plate, and the powder outlet (12) is configured on the surface of the porous fluidized plate, therefore the powder outflow is much smoother. Further, the quantity and stability of the powder feeding is improved.