Electric vehicle and monitoring and protecting method and system for vehicle driving motor of electric vehicle

The invention discloses an electric vehicle and a monitoring and protecting method and system for a vehicle driving motor thereof, which are applied to the technical field of motor control, and comprise the following steps: when any one of bus voltage values X1 and X2 determined by different algorithms exceeds a bus voltage range, when U1, V1, W1, U2 and V2 in three-phase current values determined by different algorithms are not within the bus voltage range, the bus voltage value X1 and the bus voltage value X2 are not within the bus voltage range, and the bus voltage value X1 and the bus voltage value X2 are not within the bus voltage range; and when any one of U1, V1 and W1, or U2, V2 and W2 exceeds a phase current range, the vector sum of U1, V1 and W1, or the vector sum of U2, V2 and W2 exceeds a first range, any one of the positions a1 and b1 of the driving motor determined by different algorithms exceeds a position range, and any one of the rotating speeds a2 and b2 of the driving motor determined by di