The invention discloses an exhaust gas control device and an engine. The exhaust gas control device comprises: a main body pipe, the air inlet of which is connected to an air source, the air outlet ofwhich is used for discharging air; an acting force channel, which is installed on the side wall of the main body pipe, and the air inlet of which communicates with the main body pipe, the air outletof which is connected to an inlet pipe of a supercharged pressure regulator; an on/off switch, which is located between the acting force channel and the air outlet of the main body pipe; and a pressure reducer, which communicates with the acting force channel and can exhaust and decompress the acting force channel. When the engine is rapidly accelerated, the on/off switch is quickly switched on. Due to the provision of the pressure reducer, the acting force channel can be exhausted and decompressed, and the pressure of the acting force channel is reduced, so that the pressure acting on the acting force channel is reduced, quickly achieving the effect that the air pressure in the acting force channel is greater than the sum of the engine exhaust pressure and the spring force of the supercharged pressure regulator, so that a vent valve of a supercharger is completely closed, the supercharger is fully pressurized, and the engine quickly obtains higher power.