The invention discloses an electro-hydraulic control mechanism with adjustable pressure sensitivity. The electro-hydraulic control mechanism comprises a first servo unit, a second servo unit, a definite value pressure reducing valve, an unloading unit, a two-position three-way reversing valve and the like. The definite value pressure reducing valve enables the pressure difference to be produced, and accordingly a pressure signal is produced. The pressure signal is converted to a mechanical signal of the first servo unit, and accordingly the discharging amount of a piston variable displacement pump is controlled. Because the definite value pressure reducing valve is arranged, the system pressure and the piston variable displacement pump build the servo relationship, and accordingly the piston variable displacement pump can be adjusted according to the piston system pressure. The two-position three-way reversing valve enables the piston variable displacement pump to switch between the two discharging amount regulating modes. In addition, an electromagnet can improve the sensitivity of pressure regulating or the pressure regulating range.