The invention discloses a washing and dehydrating system for an automatic production line of a tunnel type washing machine. The washing and dehydrating system for the automatic production line of the tunnel type washing machine comprises the tunnel type washing machine and at least two centrifugal dehydrators, a linen conveying device is arranged between the discharge hole of the tunnel type washing machine and the feed hole of each centrifugal dehydrator, and the work of the centrifugal dehydrators and the linen conveying devices is controlled by a control device; the linen conveying device comprises a fixed framework, a movable framework arranged on the fixed framework, and a feed conveying device arranged on the movable framework, the left end of the fixed framework is located at the discharge hole of the tunnel type washing machine, and the centrifugal dehydrators are arranged on the rear side of the fixed framework at intervals; a first material guide plate used for guiding wet linen into the corresponding centrifugal dehydrator is arranged on each centrifugal dehydrator. The washing and dehydrating system for the automatic production line of the tunnel type washing machine has advantages that the use cost is low, the linen damage is avoided, and the tunnel type washing machine can be well used with each centrifugal dehydrator.