The invention discloses a threaded pump. The threaded pump is simple in structure, safe in work, high in reliability, convenient to use and maintain, continuous and uniform in liquid outlet and stable in pressure. The threaded pump comprises a threaded pump shell, a threaded pump cover and a threaded pump body, wherein the threaded pump shell is provided with an installation opening; the threaded pump cover is fixed to the installation opening in a matched manner; and the threaded pump body is matched with the threaded pump shell and the threaded pump cover in inner diameter. A thread is machined on the outer circle of the threaded pump body. The inner circle of the threaded pump shell and the inner circle of the threaded pump cover are unthreaded holes and cooperate with the outer circle face of the threaded pump body to form a spiral groove. One end face of the threaded pump body is connected with a rotating shaft, and the other end of the threaded pump body is provided with a groove. The exterior of the threaded pump body and the threaded pump shell form a second cavity. The threaded pump cover is provided with an oil inlet matched with a one-way valve; and the inner side of the threaded pump cover and the groove of the threaded pump body form a first cavity. The first cavity communicates with the second cavity through the spiral groove. When the threaded pump works, the threaded pump body rotates in the threaded pump shell and the threaded pump cover, and oil liquid is pumped into the second cavity from the first cavity.