A water pipe connector apparatus has a main body and a sleeve. A stop surface is formed at a top of the main body and a plurality of limiting blocks are formed on an inner wall of the sleeve. The sleeve has a plurality of oblique thrust pads arranged alternately with the limiting blocks on the inner wall of the sleeve. The sleeve has an abutment member positioned at a top of the inner wall thereof. The sleeve shifts longitudinally when the thrust pads are aligned with guide lugs of the main body. The sleeve is fixed when the limiting blocks are aligned with the guide lugs.