The invention relates to a rubber dam self-collapsing protecting method and device and a device using method. According to the rubber dam self-collapsing protecting method, automatic drainage and
dam collapse of a rubber dam, namely, a rubber dam bag in a water-filled state are controlled through a lever
system. The rubber dam self-collapsing protecting device is mainly composed of water inlet
pipe, the lever
system, a bottom shaft rotation valve, a drain
pipe and the rubber dam bag which are sequentially connected; one end of a transverse straight rod of the lever
system is provided with a water collecting tank communicated with the water inlet
pipe, and the other end of the transverse straight rod of the lever system is provided with a pulling straight rod which can open the bottom shaft rotation valve; when the
water level is higher than the water inlet end of the water inlet pipe, water enters the water collecting tank, the water collecting tank sinks, therefore, the lever system loses balance and drives the pulling straight rod to move upwards, then the bottom shaft rotation valve is opened, and automatic
dam collapse of the rubber dam is achieved. The rubber dam self-collapsing protecting method and device and the device using method have the advantages that the automatic
dam collapse of the rubber dam can be achieved through a hydraulic and automatic mode, therefore, accidents caused by the fact that the dam cannot be collapsed in time can be effectively avoided, and life safety and property safety of people can be guaranteed.