The invention discloses a method and a system for detecting states based on an intelligent automobile bracelet key, and belongs to the technical field of automobile electronics. The method is appliedto an intelligent automobile bracelet key system. The intelligent automobile bracelet key system comprises the bracelet key, a control module PEPS (passive entry passive start), a BCM (body control module) and an early warning module, wherein the bracelet key is put on the wrist of a driver, and the control module PEPS is arranged on a vehicle. The method includes the steps: acquiring triggered search signals transmitted by the PEPS after the vehicle is started by the bracelet key; transmitting feedback signals to the PEPS; determining whether the bracelet key is matched with the vehicle or not according to the feedback signals by the PEPS; acquiring internal alcohol concentration information of the driver by the bracelet key if the bracelet key is matched with the vehicle; transmitting the internal alcohol concentration information to the PEPS; determining whether the driver is in a drunk state or not after receiving the internal alcohol concentration information by the PEPS; forbidding an engine to start if the driver is in the drunk state. The driver conveniently carries the system, and drunk driving is effectively prevented.