Multi-mode steering system

The utility model belongs to vehicle steering, and discloses a multi-mode steering system which comprises a steering mechanical system and a power-assisted steering system. The steering mechanical system comprises a steering gear, a rocker arm, a drag link, a front trapezoidal mechanism and a rear trapezoidal mechanism. The end of an output rotating shaft of the steering gear is connected with therocker arm, the tail end of the rocker arm is connected with the straight pull rod, the straight pull rod is connected with the front trapezoidal mechanism, and steering operation of the front trapezoidal mechanism is achieved. The power-assisted steering system comprises a steering oil tank, a steering pump, a first rear group electromagnetic valve, a second rear group electromagnetic valve, a centering power-assisted combined cylinder, a linkage electromagnetic valve, a first linkage cylinder, a second linkage cylinder, an energy accumulator and a centering electromagnetic valve. Accordingto the multi-mode steering