A plastic faucet body with copper connecting legs comprising: a plastic member injection molded from plastic material and including two seat portions mounted on two sides thereof, a connecting portion defined between the two seat portions, and two support feet extending downwardly from two bottom ends of the two seat portions; each support foot having an inlet formed on a bottom end thereof and a channel arranged in the each support foot and communicating with each seat portion; the connecting portion having at least one exit defined on a middle section thereof and having a tunnel defined therein and communicating with the each seat portion; two copper connecting legs made of cooper material, and each copper connecting leg being engaged on an outer wall of the each support foot of the plastic member and having a threaded section formed on the outer wall thereof; characterized in that: a bottom end of the each copper connecting leg extending a predetermined distance from a bottom end of the each support foot so as to define a fitting section on an inner wall of the each copper connecting leg; a lower coupling portion (a) being formed on a connection zone of the bottom end of the each support foot and the inner wall of the each copper connecting leg; a plastic sleeve, at least one part of which is engaged with the fitting section of the each copper connecting leg, the plastic sleeve having at least one seal element fitted on an outer wall thereof so as to provide a sealing effect and to prevent water from leakage via the lower coupling portion (a) and a seal inner face formed on an inner wall of the plastic sleeve; wherein the seal inner face has a circularly groove-shaped face arranged on a lower end thereof and a conically inner face connecting with an upper end of the circularly groove-shaped face. a plastic member injection molded from plastic material and including two seat portions mounted on two sides thereof, a connecting portion defined between the two seat portions, and two support feet extending downwardly from two bottom ends of the two seat portions; each support foot having an inlet formed on a bottom end thereof and a channel arranged in the each support foot and communicating with each seat portion; the connecting portion having at least one exit defined on a middle section thereof and having a tunnel defined therein and communicating with the each seat portion; two copper connecting legs made of cooper material, and each copper connecting leg being engaged on an outer wall of the each support foot of the plastic member and having a threaded section formed on the outer wall thereof; characterized in that: a bottom end of the each copper connecting leg extending a predetermined distance from a bottom end of the each support foot so as to define a fitting section on an inner wall of the each copper connecting leg; a lower coupling portion (a) being formed on a connection zone of the bottom end of the each support foot and the inner wall of the each copper connecting leg; a plastic sleeve, at least one part of which is engaged with the fitting section of the each copper connecting leg, the plastic sleeve having at least one seal element fitted on an outer wall thereof so as to provide a sealing effect and to prevent water from leakage via the lower coupling portion (a) and a seal inner face formed on an inner wall of the plastic sleeve; wherein the seal inner face has a circularly groove-shaped face arranged on a lower end thereof and a conically inner face connecting with an upper end of the circularly groove-shaped face. a bottom end of the each copper connecting leg extending a predetermined distance from a bottom end of the each support foot so as to define a fitting section on an inner wall of the each copper connecting leg; a lower coupling portion (a) being formed on a connection zone of the bottom end of the each support foot and the inner wall of the each copper connecting leg; a plastic sleeve, at least one part of which is engaged with the fitting section of the each copper connecting leg, the plastic sleeve having at least one seal element fitted on an outer wall thereof so as to provide a sealing effect and to prevent water from leakage via the lower coupling portion (a) and a seal inner face formed on an inner wall of the plastic sleeve; wherein the seal inner face has a circularly groove-shaped face arranged on a lower end thereof and a conically inner face connecting with an upper end of the circularly groove-shaped face.