A liquid-cooled heat dissipation apparatus includes a water cooling module (1), a water pump set (2) and a reservoir tank (3). The water cooling module (1) includes a heat exchange unit (11) and a base (12) having a pump receiving slot (121) and a heat exchange chamber (T). The base (12) includes a water inlet channel (G1), drainage channel (G2) and first channel (G10). The water pump set (2) is arranged inside the pump receiving slot (121) and includes a rotor assembly (21) and a blade assembly (23). The blade assembly (23) is attached onto the rotor assembly (21) and includes a second channel (G20). The reservoir tank (3) is detachably stacked onto the water cooling module (1) and includes a water containing chamber (R) and a water supply channel (G3) formed thereon. Accordingly, the apparatus achieves the effects of independent reservoir, readily water supply and pipeline exhaust simultaneously.
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