Magnetorheological pilot overflow valve

The utility model provides a magnetorheological pilot overflow valve, belonging to the technical field of hydraulic transmission. The magnetorheological pilot overflow valve comprises an end cover, an end cover sealing ring, a magnetorheological valve shell, a coil, an iron core, a valve core, a pilot valve body, a pilot valve sealing ring, a damping block, a main valve sleeve sealing ring, a spring, a guide rod sealing ring, a guide rod, a main valve sleeve, a main valve core, a main valve seat sealing ring, a main valve seat, a main valve body and a damper, wherein the main valve core is in a parabolic bulb shape, the half cone angle of the valve core is greater than the half core angle of the valve seat, the pressure difference between the inlet and the outlet of a conical valve can be reduced effectively, a minimum negative pressure moves forward and backward along a liquid flow direction and occurs behind the valve core, and the occurrence of the minimum negative pressure on the valve seat is avoided, so