A blood leakage warning device for dialysis patient is applied to cover an injection site, comprising a cover absorber, two detection modules, a control module and an alarm module. The cover absorber is used for absorbing blood leakage. The two detection modules are disposed on the cover absorber at intervals. The control module is electrically connected to the two detection modules to detect whether the cover absorber absorbs the blood. The alarm module is electrically connected to the control module. The alarm module issues an alarm when the cover absorber absorbs the blood.
