The invention belongs to the field of waste gas treatment and particularly relates to an annular waste gas treatment device assembly. The annular waste gas treatment device assembly comprises a shell,an air inlet, a low-temperature plasma generator group, a baffle and an air outlet, wherein the low-temperature plasma generator group is shaped like an annular tyre; a channel for gas to pass through is formed in the center of the low-temperature plasma generator group; and the low-temperature plasma generator group comprises a solenoid coil, a shell, a low-voltage discharging electrode, a low-voltage discharging electrode dielectric layer, a high-voltage discharging electrode dielectric layer and a high-voltage discharging electrode sequentially from outside to inside. According to the annular waste gas treatment device, the low-temperature plasma generator group is shaped like an annular tyre, so that the retention time of the waste gas in plasma atmosphere is greatly prolonged; the electrified solenoid coil is used for generating a magnetic field and the intensity of the magnetic field is adjusted by adjusting the size of the voltage of the electrified solenoid coil so that charged high-energy ions excited by a low-temperature plasma device are distributed uniformly, the contact area of the charged high-energy ion and the waste gas is larger, and the waste gas treatment is more efficient.