The invention discloses a chemical compound driving and antiscaling oil pump of soft plunger, which comprises a pump cylinder (5) and a plunger body (3). In the pump cylinder (5), the plunger body (3) is placed; in the plunger body (3), a central support (4) is placed. Out the central support (4) that is provided with a long strip-like hole, the inner layer of the liner for the plunger body (8), the outer layer of the liner for the plunger body (7), and a seal ring (6) are looped sequentially; the upper and lower end of the inner layer of the liner for the plunger body (8), the outer layer of the liner for the plunger body (7), and the seal ring (6) are provided with upper and lower lock nuts (10, 9); the central support (4) is threadedly connected with the upper and lower lock nuts (10, 9). The plunger oil pump can effectively prevent any pump blocking, prolong to the max. extent the time period between two maintenances, also improve the pump efficiency and reduce the production cost.