The invention discloses a method and a device for eliminating the jam of the valve core of an oil pump servovalve. The method comprises the following steps: mechanical returning force is applied to the valve core of a servovalve so that the valve core of the servovalve can return to an original position under the resultant force of pulling force and mechanical returning force of a return spring. The device comprises a shifting fork (1) and a variable shifting block (2), wherein a support shaft (3) is arranged on the shifting fork (1), a cambered hole(4) is arranged on the variable shifting block (2), and the support shaft (3) on the shifting fork (1) is inserted in the cambered hole (4) of the variable shifting block (2). In the premise that the normal control on the servovalve by external control variables is ensured, the problem of stamping of the valve core 5 of the servovalve, which is caused by insufficient pulling force of the return spring, can be solved by the invention, thereby greatly increasing the reliability of automatic adjustment of an oil pump.