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.