The invention discloses a multifunctional hydraulic interconnected suspension system and relates to the technical field of automobiles. The system comprises left hydraulic cylinders, right hydraulic cylinders, a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a synchronous equivalent converter, a steering gear, a sensing device, a hydraulic pump and an oil tank, the first connecting pipe is connected between upper connecting ports of the left hydraulic cylinders, the second connecting pipe is connected between lower connecting ports of the right hydraulic cylinders, the third connecting pipe is connected between the left hydraulic cylinder and the right hydraulic cylinder which are positioned diagonally in a crossed manner, one end of the fourth connecting pipe is connected on the third connecting pipe while the other end of the same is connected on the synchronous equivalent converter, the steering gear is connected with the synchronous equivalent converter through a pipeline, the sensing device is connected with the steering gear, and the first connecting pipe and the second connecting pipe are connected with the synchronous equivalent converter through pipelines respectively. The system causes little bumping, can prevent sideways inclination, actively adjust rigidity and automatically control vehicle balance and is sensitive in reaction and high in stability and comfort.