The invention discloses an automatic urinary catheterization system. Closing of a urinary catheterization tube can be automatically controlled according to changing of urine pressure of a human body, automatic urination is realized, the control precision is high, individual control can be realized according to different patients and the current postures of the patients, and the normal bladder functions of a patient are guaranteed to the great extent. In order to precisely and automatically control an automatic urination process, an initial value processing unit, a signal processing unit, a urination threshold value setting unit, a urination channel control unit and an early warning unit are arranged in a control unit of the system; and moreover, an end of a catheter with an electronic liquid draining valve is connected with an intelligent urine volume measuring unit. The initial value processing unit is used for setting initial values of a pressure sensor unit; the signal processing unit is used for processing signals of an acquired value of the pressure sensor unit; the acquired value is compared with a urination threshold value set in the urination threshold value setting unit; and when the acquired value reaches the urination threshold value, a urination channel is opened by using the urination channel control unit.