The invention belongs to the technical field of intelligent traffic control, and discloses a phase sequence-duration coordinated fine-grained
artificial intelligence traffic signal control method and device. The method comprises the following steps: firstly, obtaining vehicle position and speed data of each entrance lane of a signalized intersection, dividing cells with gradual change lengths, collecting vehicle count and average speed in the cells, constructing a two-channel 3D traffic state
tensor, and realizing fine-grained sensing; secondly, a Transform
encoder is adopted to process a state
tensor output global representation, a state value and a dominant function are subjected to parallel calculation based on a D3QN architecture, Q value overestimation is avoided through a double-Q network, and
artificial intelligence decision optimization is completed; thirdly, introducing a priority experience playback mechanism, determining a sample priority and sampling according to a TD error, adjusting loss and optimizing training efficiency in combination with an
importance weight, designing a phase sequence-duration coordination action pair, constraining the maximum
green light duration and continuous expansion times of a straight-going / left-turning phase sequence, avoiding phase sequence hunger, and realizing fine-grained
action control.