The invention relates to a novel safe alarm main component device of a disposable transfusion device, which comprises a 
liquid storage cavity, a feeding liquid dropper head, a liquid outlet 
pipe, liquid 
medicine, a connecting double-floating body, an elastic thin slice bridge piece, an 
electrode rod, a cone-shaped weight drop, a thin and 
flexible cable, an 
electrode connecting plug, a time-
delay cavity, an auto alarm 
assembly, an 
electrode connecting inserting sleeve, a power source, a coder, a light 
projector, a language reminder, an adjustor switch knob and a cone-shaped inclined wall action face of the 
liquid storage cavity. The liquid 
medicine and the connecting double-floating body are arranged in the 
liquid storage cavity, the elastic thin slice bridge piece, the electrode rod, the cone-shaped weight drop and the thin and 
flexible cable are arranged on the connecting double-floating body, and the thin and 
flexible cable, the electrode connecting plug, the feeding liquid dropper head, the time-
delay cavity, the liquid outlet 
pipe and the cone-shaped inclined wall action face are arranged on the liquid storage cavity; the electrode connecting inserting sleeve, the power source, the language reminder, the light 
projector, the coder and the adjustor switch knob are arranged on the auto alarm 
assembly. The device can be matched, connected and used with the disposable transfusion device.