The invention discloses an automatic port cold chain continuous transmission system which improves the working efficiency of port cold chain transmission and guarantees cold freshness of cargos. According to the technical scheme, the system comprises movable cargo racks, movable lifting tools, under-deck horizontal sliding rails, branching guide devices, under-deck lifting rails, transfer and lifting accommodation ladders, a roll-on and roll-off transfer platform, refrigeration freight vehicles and heat preservation covers. The effect that cold and fresh materials are transferred from a refrigeration cabin to the shoreside refrigeration freight vehicles and are reversely transferred from the shoreside refrigeration freight vehicles to the refrigeration cabin is realized, the risk of overturn in the cargo shifting process due to ship rocking is overcome, and automatic and insulated continuous transportation throughout is realized.