Tail gas treatment system, control method thereof and vehicle

The invention relates to the technical field of tail gas treatment, and particularly discloses a tail gas treatment system, a control method thereof and a vehicle. The tail gas treatment system comprises a urea spraying device, the urea spraying device is provided with a first heating cavity and a second heating cavity, and the first heating cavity communicates with the second heating cavity through a first electromagnetic valve; the urea spraying device further comprises a first spraying pipe and a second spraying pipe, the first spraying pipe is connected with the second heating cavity through a second electromagnetic valve, the second spraying pipe is connected with the first heating cavity through a third electromagnetic valve, and the first spraying pipe and the second spraying pipe can spray urea liquid into the exhaust pipe. The urea injection device is provided with the first heating cavity and the second heating cavity to conduct two-stage heating on urea liquid, the urea liquid can be selectively he