The utility model discloses a dust-proof, breakage-proof and leakage-proof coded lock catch for a USB port of a computer. The dust-proof, breakage-proof and leakage-proof coded lock catch for the USB port of the computer comprises a front push-pull coded lock, a rear lifting type coded lock and a dust-proof plug, wherein a fixed lock cover is fixedly connected to one side of the USB port, a push-pull sliding lock cover is embedded in the fixed lock cover, a sliding connection push-pull groove is formed in the lower portion of the push-pull sliding lock cover, a push-pull handle is arranged on the upper portion of the push-pull sliding lock cover, a coded lock is arranged at the position, parallel to the fixed lock cover, of the other side of the USB port, the rear lifting type coded lock comprises a rear liftable lock cover, the rear liftable lock cover is connected to a host rear cover in a rotary mode through a connecting shaft, liftable lock cover hollowed-out holes are formed in the surface of the rear liftable lock cover, a rear coded lock is arranged on the surface of one side of the rear liftable lock cover, and the USB dust-proof plug is arranged at the position of the USB port. The coded lock catch for the USB port of the computer is capable of preventing dust, breakage and leakage and protecting the computer, and the service life is prolonged to a certain extent.