The invention provides a smoke generator. The smoke generator comprises a gas turbine and a smoke generating system, wherein the gas turbine comprises a gas turbine main machine, and the gas turbine main machine provides combustion-gas flow with required temperature and flow rate for the smoke generating system. The smoke generating system comprises a first exhaust nozzle and a mist oil input system, wherein the first exhaust nozzle communicates with the gas turbine main machine in a fluid mode, and the first exhaust nozzle is provided with a first exhaust nozzle inlet arranged close to the gas turbine main machine and a first exhaust nozzle outlet arranged away from the gas turbine main machine. The mist oil input system is used for conveying mist oil into the first exhaust nozzle, so that the mist oil forms smog under the action of the combustion-gas flow provided by the gas turbine main machine, and the smog is ejected outwards through the first exhaust nozzle outlet. The inventionfurther provides an operation method of the smoke generator. The smoke generator and the operation method of the smoke generator have the advantages of high smoke generating efficiency, high exhaust gas stability, large smoke generating amount, compact structure, good working stability, flexible maneuvering and the like.