Multifunctional silencing tank fixing support and multifunctional silencing tank fixing assembly

The invention relates to the field of automobiles, in particular to a multifunctional silencing tank fixing support which is used for fixing a silencing tank to a longitudinal beam of an automobile body and comprises a first structural arm, a second structural arm and a support body. The first structural arm and the second structural arm are fixedly connected with the two sides of the support body respectively. The support body is used for being fixedly connected with a vehicle body longitudinal beam. The first structural arm and the second structural arm extend from the two sides of the support body to one side of the silencing tank. A first connecting part is arranged on the first structural arm, a second connecting part is arranged on the second structural arm, and the first connecting part and the second connecting part are used for being detachably connected with the silencing tank; the second structural arm is also provided with a first wire harness fixing part; the first wire harness fixing part is use