The invention relates to a mobile-type tail-gas treatment process and device. The mobile-type tail-gas treatment device mainly comprises a condensation heat exchanger, a three-phase separator, membrane separation assembly, a vacuum pump, a heat exchanger, a catalytic oxidation reactor, a blower, an air supplement machine, a vortex flow meter, a concentration monitor, a fire barrier, a vacuum meter, and valves. According to the invention, through the heat exchanger and the three-phase separator, residual moisture is condensed, partial organics are dissolved in an oil phase for direct recovery, uncondensed and unabsorbed tail gases enter the membrane separation assembly, after separation is performed by the membrane separation assembly, the pollutant concentration of tail gases in the retentate side of the membrane separation assembly is reduced, discharging is directly performed after a standard is reached, dense gases at the permeate side of the membrane separation assembly are subjected to a low-temperature catalytic oxidation reaction, and discharging is directly performed after the treated dense gases reach the standard. The mobile-type tail-gas treatment process and device solve the pollution problems caused by discharge, and protect atmospheric environments.