A fuel pressure regulator and fuel filter assembly, comprising: a housing , having an accommodating cavity and a connecting end , the connecting end having a fuel channel in communication with the accommodating cavity ; a filter element , located in the accommodating cavity of the housing ; a cover plate , located at one end of the housing , the cover plate being provided with a fuel inlet and a fuel outlet ; a rear cover , being hollow inside, with one end being an opening end and another end being a spring seat , and an opening being provided in a sidewall of the rear cover , the opening end of the rear cover being connected to the connecting end of the housing ; a spring , being located in the rear cover , a first end of the spring being pressed against the spring seat of the rear cover ; a seal , being located in the rear cover , with a second end of the spring being pressed against the seal , wherein when fuel pressure in the housing is no greater than a spring preload, the seal is pressed tightly against the connecting end of the housing and closes the fuel channel ; and characterized by a fixing ring , which fits the rear cover to fix the rear cover to the connecting end of the housing , the fixing ring being welded by laser to the connecting end , whereby the connecting end of the housing has an end wall , a sealing part protruding from the end wall , and a welding part ; the fuel channel runs through the sealing part , the opening end of the rear cover is located outside the sealing part , and the opening end has a bent part formed by outward bending; the fixing ring is located outside the rear cover and presses against the bent part , and the fixing ring is connected by laser welding to the welding part . a housing , having an accommodating cavity and a connecting end , the connecting end having a fuel channel in communication with the accommodating cavity ; a filter element , located in the accommodating cavity of the housing ; a cover plate , located at one end of the housing , the cover plate being provided with a fuel inlet and a fuel outlet ; a rear cover , being hollow inside, with one end being an opening end and another end being a spring seat , and an opening being provided in a sidewall of the rear cover , the opening end of the rear cover being connected to the connecting end of the housing ; a spring , being located in the rear cover , a first end of the spring being pressed against the spring seat of the rear cover ; a seal , being located in the rear cover , with a second end of the spring being pressed against the seal , wherein when fuel pressure in the housing is no greater than a spring preload, the seal is pressed tightly against the connecting end of the housing and closes the fuel channel ; and characterized by a fixing ring , which fits the rear cover to fix the rear cover to the connecting end of the housing , the fixing ring being welded by laser to the connecting end , whereby the connecting end of the housing has an end wall , a sealing part protruding from the end wall , and a welding part ; the fuel channel runs through the sealing part , the opening end of the rear cover is located outside the sealing part , and the opening end has a bent part formed by outward bending; the fixing ring is located outside the rear cover and presses against the bent part , and the fixing ring is connected by laser welding to the welding part . <EOS>