The utility model provides a small sand mulling pumping device. The small sand mulling pumping device comprises a skid frame, an engine, a mechanical transmission box and a plunger pump, the engine, the mechanical transmission box and the plunger pump are arranged on the skid frame, the plunger pump is arranged on one side of the transmission box, a sand mulling tank is arranged on one side of the plunger pump, a horizontal spiral sand conveying device is arranged at the top end of the sand mulling tank, the input end of the sand mulling tank is connected with a suction manifold, the output end of the sand mulling tank is connected with a discharge manifold, and the discharge manifold is connected with the plunger pump. The small sand mulling pumping device further comprises a PLC unit used for controlling the rotation speed of the transmission box and the rotation speed of a sheave of the horizontal spiral sand conveying device, the horizontal spiral sand conveying device comprises a horizontal sand conveying spiral, a sand storage device arranged at the upper end of the horizontal sand conveying spiral and a sheave counter arranged at one end of the horizontal sand conveying spiral, and the horizontal sand conveying spiral is perpendicular to the axial direction of the sand mulling tank. Small discharge capacity of sand mulling liquid is achieved through the plunger pump, low sand concentration is achieved due to the fact that the horizontal spiral sand conveying device is arranged at the top of the sand mulling tank, integrated skid installation is conducted, accurate control over small discharge capacity and low sand concentration is achieved and it is guaranteed that operation of a coiled tubing is smoothly carried out.