The invention discloses an effusion discharging apparatus used in oncology nursing. The effusion discharging apparatus used in oncology nursing comprises an effusion discharging apparatus body; a handle, which is L-shaped as a whole, is fixedly arranged on the left side of the upper surface of the effusion discharging apparatus body; an effusion collection chamber is arranged inside the effusion discharging apparatus body; and a piston chamber and a driving chamber are arranged, above the effusion collection chamber, inside the effusion discharging apparatus body. By adopting cooperation of aneffusion discharging needle, a switch controller, a driving motor, a rotating wheel, a connecting pin, a movable rod, a hinged seat, a piston rod and a sliding hole, the effusion discharging apparatus used in oncology nursing is capable of allowing a piston plate to carry out leftward and rightward piston motion inside the piston chamber, thereby rapidly discharging tumor effusion from the patient body; and thus, the effusion discharging apparatus is time-saving and labor-saving. Moreover, as a whole apparatus, the effusion discharging apparatus is small in volume, easy to operate and use, very convenient for portable use, and suitable for promoted use.