Urea double-injection aftertreatment system, control method thereof and vehicle

The invention relates to the technical field of urea spraying, and discloses a urea double-spraying aftertreatment system, a control method thereof and a vehicle, the urea double-spraying aftertreatment system comprises a first selective catalytic reduction assembly and a second selective catalytic reduction assembly which are sequentially connected in series, and the first selective catalytic reduction assembly is a tight coupling selective catalytic reduction assembly; the second selective catalytic reduction assembly is located at the downstream of the first selective catalytic reduction assembly; the first selective catalytic reduction assembly is further connected with a bypass branch in parallel, and a three-way valve is arranged at the upstream intersection of the bypass branch and the branch where the first selective catalytic reduction assembly is located. A first-stage urea injection device is arranged at the upstream of the first selective catalytic reduction assembly, and a second-stage urea injec