The utility model discloses a data channel system for industrial ethernet, including integrated in a programmable logic device communication control module, write control module, data caching module, read control module and interrupt module, constitute a three layer model including physical layer, data link layer, application layer, simplified five layers of model of network transmission, and adopt high -speed two port RAM as the data frame analytic, verify and buffer area during the notice sense data, improved data transmission's efficiency when improving the data transmission reliability, have the advantage of high throughput, and, under the control of channel?control module and interrupt module, all formed the sliding window access mechanism to reading and writing, can effectively prevent the data pollution, the data of nevertheless reading out yet in the passageway of avoiding keeping in are covered by new data, have improved transmitting?data's reliability.