The invention discloses a bladder intermittent drainage system which comprises a urine pipe, a controllable conducting switch, a drainage bag liquid inlet pipe and a drainage bag provided with a liquid discharging valve. The controllable conducting switch is arranged between the urine pipe and the drainage bag liquid inlet pipe and used for controlling communication and blocking of an inner cavity of the urine pipe and an inner cavity of the drainage bag liquid inlet pipe. The controllable conducting switch comprises a power supply, a controller, a coil, a conducting slide block and a magnetic piece. The controller controls a power-up state of the coil so as to enable magnetic force produced by the coil and magnetic force of the magnetic piece to interact, and therefore the conducting switch can be turned on or turned off. The bladder intermittent drainage system has the advantages that urine can be automatically drained in time, the phenomenon of infection of the urinary system caused by regurgitation of the urine when the urine is not drained in time is avoided, and workloads of nursing staff are relieved, operation is convenient to perform, and the structure is simple. In addition, the requirement for material performance and physical restorability of the urine pipe or the drainage bag liquid inlet pipe is lowered.