The invention provides a water filter for a refrigerator. The water filter comprises a cylindrical filter main body, a filter front cover component, a filter back cover component and a water pipe locking mechanism, wherein the filter front cover component and the filter back cover component are positioned at the two ends of the filter main body; interfaces are formed on the front cover component and the back cover component respectively; the water pipe locking mechanism comprises a clamping head and a clamping seat; the clamping head has an integrally cylindrical structure; a groove is formedon the outer wall of the clamping head along a circumferential direction; one end of the clamping head is provided with an elastic claw part which projects outwards along a radial direction; the clamping seat has an integrally cylindrical structure; an internal through hole of the clamping seat accommodates the clamping head; a depressed conical port is formed on the inner wall of the clamping seal along the circumferential direction; the elastic claw part is embedded in the depressed conical port; the interfaces on the front cover component and the back cover component have cylindrical structures; and the inner walls of the front cover component and the back cover component are provided with stepped parts for positioning the clamping seat. The water filter can be arranged rapidly in a very simple and convenient mode through a rapid joint interface and sealing is ensured under high pressure.