The invention provides a waste gas treatment process and a fluidized-bed bioreactor used for the same. The waste gas treatment process comprises the processes such as waste gas pressurization, waste gas reaction, waste gas separate-circulation and waste gas separate-emission; and waste gas is subjected to circular fluidization and enforced mass transfer in the reactor to be fully reacted with microorganisms at the temperature of between 15 and 40 DEG C. The provided fluidized-bed bioreactor used for the waste gas treatment process consists of a shell, a gas distributor, a guiding cylinder, a cap, a gas-liquid separator, a seal cover, and longitudinal sampling ports at different positions of the shell; and the guiding cylinder and the cap separate the inner cavity of the reactor into a lifting area, a reduction area and a separation area, so that the waste gas is circularly fluidized between the lifting area and the reduction area, and three phases, namely gas, liquid and solid, strengthen the mass transfer function. The concentration range of pollutants treated by the process and the fluidized-bed bioreactor is wide, the reaction efficiency is high, the reaction time is short, and the reactor occupies small area, and is quick to start and difficult to block.