Backwashing and filtering device for heat exchanger of seawater desalination system

The invention discloses a backwashing filtering device for a heat exchanger of a seawater desalination system, which relates to the technical field of filtering devices, and comprises a filter, a backwashing mechanism, and a water inlet and a water outlet which are respectively arranged at two ends of the filter; a connection mechanism; and a shielding mechanism. By arranging the backwashing mechanism and the shielding mechanism, when the filter is used, a baffle performs shielding operation on a first connecting groove and a second connecting groove at the moment, so that water cannot be discharged through a first connecting port and a second connecting port; when backwashing is carried out, a first connecting pipe and a second connecting pipe are connected with a first connecting opening and a second connecting opening respectively, and in the pipeline connecting process, a baffle automatically rotates to open a first connecting groove and a second connecting groove, shield a water inlet groove and a water