The invention discloses a water filtering flushing device for a coke tank, and aims to overcome the defects that the coke storage tank in the prior art has no dehydration function on the cokes and a filter screen has no backflush function. The water filtering flushing device for the coke tank comprises a plurality of coke tank water filtering groove bases, grid nets, flushing main pipes, flushing elbow pipes and flushing spray sprinklers, wherein the plurality of coke tank water filtering groove bases are arranged at the bottom of the coke tank in parallel; each coke tank water filtering groove base is strip-shaped; one end of each coke tank water filtering groove base is arranged on a tank wall; water filtering grooves are formed between the two adjacent coke tank water filtering groove bases and between each coke tank water filtering groove base and the tank wall; the grid nets are paved on the upper parts of the water filtering grooves; the flushing main pipes are also arranged on the lower parts of the water filtering grooves in the length directions of the coke tank water filtering groove bases; the flushing main pipes are fixed on the coke tank water filtering groove bases or the tank wall through a flushing pipe support; the flushing elbow pipes are arranged on the flushing main pipes and are uniformly distributed along the flushing main pipes; the flushing spray sprinklers are mounted on the end parts of all flushing elbow pipes; nozzles are mounted on the flushing spray sprinklers.