The invention discloses a protective housing of an electronic device and an electronic device assembly. The protective housing of the electronic device comprises a shell and a plurality of protrusions; the shell comprises a base plate and a side plate which are connected with each other and which define a receiving chamber for receiving the electronic device; the plurality of protrusions protrude from the outer surface of the shell. The protective housing of the electronic device can better resist to impact and relieve damage from direct collision to the electronic device.