EHB brake-by-wire system with redundancy function

The invention relates to an EHB brake-by-wire system with a redundancy function, relates to the field of automobile brake systems, and is used for solving the problems that most of existing electro-hydraulic brake-by-wire systems are provided with only one set of driving devices, and once the existing electro-hydraulic brake-by-wire systems are damaged in the driving process, vehicles cannot be effectively braked, and great risks are brought to automatic driving. Meanwhile, the problem that a brake wheel cylinder of a traditional electro-hydraulic brake-by-wire system needs four liquid inlet valves and four liquid outlet valves to complete functions such as an ABS, a TCS and an AEB is solved. A redundant drive device is additionally arranged on the basis of a traditional electro-hydraulic drive-by-wire brake system, the situation that a main drive subsystem and a redundant drive subsystem are in failure is considered, a standby power assisting device is additionally arranged to assist a driver in braking, and