The invention discloses a driver alcohol detecting and alarming and starting forbidding device. The device comprises a base, a power supply switch, a seat base plate, a seat rest, a first weight sensor, a second weight sensor, a shell, a first sliding slot, a first electric pushing rod, a sliding plate, a wind speed sensor, an alcohol detector, a timer, a second sliding slot, a second electric pushing rod, a pushing plate, a first sensor and a second sensor. The driver alcohol detecting and alarming and starting forbidding device has a smart structure and powerful functions, not only can detect whether a driver drinks wine, but also effectively prevent an drunk driver from avoiding alcohol detection in other manners, so that a purpose of starting a vehicle is achieved; and meanwhile, when the device detects that the driver drinks the wine, the vehicle automatically powers off and starts timing, so that the vehicle cannot restart within a certain time; therefore, serious consequences on the driver self or other persons due to drunk driving of the driver can be greatly avoided.