The invention provides a keyless system positioning method based on a Bluetooth RSSI. The keyless system positioning method is characterized by comprising the following steps: firstly, initially judging whether a key is in or outside a car; establishing a car interior and exterior space coordinate system, setting up four base stations, separately installing the four base stations in the centers of four sides of the car, and when an intelligent key of the car receives signal strengths sent by the four base stations, sequentially comparing each strength to judge which quadrant the key is located; calculating the distances from the key to the four base stations according to the signal strengths and an in-car attenuation model, and further judging whether the key is in or outside the car; obtaining the corrected distances from the key to the four base stations by using an in-car attenuation neural network model or a free space attenuation model according to whether the key is in or outside the car; and then positioning the location of the key by using a twice-weighted centroid sectional positioning algorithm. By adopting the method provided by the invention, the positioning accuracy of the intelligent car key can be greatly improved.