Siphon device capable of responding to rainfall process with high precision

The invention provides a siphon device capable of responding to a rainfall process with high precision. The siphon device is mounted between a rain receiver and a metering tipping bucket in a rain gauge; the siphon device comprises a main body piece, a siphon body and a middle piece; the main body piece is fixedly installed at the bottom of the rain receiver; the siphon body is fixedly installed on the main body piece; a siphon inlet is formed in one side of the upper portion of the siphon body, and a siphon outlet is formed in the bottom of the siphon body; the siphon inlet of the siphon bodyis installed in the main body piece after installation; the middle piece is fixed on the siphon body in the main body piece; a cavity with an opening in the bottom face is formed in the middle piece;the siphon inlet is located in the cavity; gaps are formed between the inner side wall, used for forming the cavity, of the middle piece and the siphon body and between the outer side wall of the middle piece and the inner si