Anti-blocking device installed in prone to blocking the conveyor funnel or chute on the outer wall by the vibration motor, vibration plate and related components, can effectively eliminate the blockage. The device has manual and automatic two kinds of work. Manual device by manual detection of blocking material and the switch lock device. The automatic device needs to be combined with the LDK-1 type blockage detector to form an automatic blocking and blocking system. The device is equipped with phase, overcurrent, short circuit protection and shutdown of the upper limit display, fault alarm and other functions to ensure that the anti-block device is in normal working condition.