Convenient preservation system for multiple strains

An aerobic air pressure tank and an oxygen-free air pressure tank are placed on the inner side of an air bin, the air outlet end of the aerobic air pressure tank and the air outlet end of the oxygen-free air pressure tank are each connected with a communicating exhaust pipe, and a steering node valve is installed in the middle of each communicating exhaust pipe in an embedded mode; one end of the steering node valve penetrates through the supporting box and is connected with a node valve rotating handle, the air outlet end of the steering node valve is connected with an air pump, and the air outlet end of the air pump is connected with an air bin exhaust pipe. According to the beeswax melting device, the heating strip in the heating strip embedding groove can be heated to heat and melt beeswax only by electrifying the heating strip, and the beeswax can be quickly melted and slide down after being heated due to the fact that the volume of the inner side of the beeswax groove becomes larger and larger outwards