Mathematical probability demonstration device

The utility model discloses a mathematical probability demonstration device. The device comprises a demonstration box and a fixed base. The bottom of the demonstration box is provided with a through hole with a valve. A collecting tank is fixedly welded at the bottom of the demonstration box; a hollow pipe is fixedly mounted at the bottom of the collecting tank; a motor is fixedly mounted on one side of the fixed base; the output shaft end of the motor penetrates through the fixed base and extends to one end of the bottom of the fixed base to be fixedly provided with a synchronous belt wheel;a synchronous pulley is also fixedly mounted at one end, positioned at the bottom of the fixed base, of the hollow pipe; the two groups of synchronous belt wheels are in transmission connection through a synchronous belt; a motor is fixedly installed in the middle of the interior of the collecting groove through screws, the output shaft end of the motor is located in the collecting groove and fixedly connected with a shif