A urine drainage device, drainage control device, drainage control system and voiding method, the urine drainage device comprising a urine inlet (31), a urine outlet (32) and a bionic bladder unit (2) the bionic bladder unit (2) comprises a main body component (21) forming a urine storage cavity (215), the urine storage cavity (215) is connected to the urine inlet (31) and the urine outlet (32) via a connecting tube (216) and further comprising a first pressure sensing surface (211) and a second pressure sensing surface (213) deforming with the change of the urine pressure in the urine storage cavity (215) a lower connecting tube (216a) is provided with a first action area (212) and a second action area (214) thereon where external forces can be applied when external forces are applied on the two action areas (212, 214) simultaneously, the communication between the urine storage cavity (215) and the urine outlet (32) is shut off and when any one external force applied on the action areas (212,214) is removed, the urine storage cavity (215) communicates with the urine outlet (32). The urine drainage device senses the change of the urine pressure in the urine storage cavity (215) via the deformation of the pressure sensing surfaces (211, 213), and further determines whether to conduct voiding according to the deformation level of the pressure sensing surfaces (211, 213), thus assisting a patient to void The present invention is of a simple structure and is suitable for large scale production.
