A computer dock comprises a main body and a retractable assembly disposed on the back side of the main body, the retractable assembly includes a slide, a connector, a supporting plate and a moving block, and both the moving block and the connector are protruded out the main body and provided function of vertical movement, when an electronic device put on the main body of the computer dock for connection the moving block is then by vertical movement to drive the slide moved in horizontal movement and further to drive the connector moved back in vertical movement relative to the slide horizontally moved, by this manner the computer dock in application allows various electronic devices with different thicknesses to connect.