The utility model discloses an automatic steady-flow monitoring device. The automatic steady-flow monitoring device comprises a flow sensor (1), an automatic steady-flow shut-off valve (2) connected with the flow sensor (1) and an automatic steady-flow monitoring instrument (3) in communication connection with the flow sensor (1), wherein the automatic steady-flow monitoring instrument (3) is also in communication connection with the automatic steady-flow shut-off valve (2). The automatic steady-flow monitoring device can achieve automatic and intelligent monitoring, facilitates centralized management, can save a great amount of manpower, is good in sensitivity and linearity, can achieve real-time adjustment according to continuous variation of fluid parameters without the need of manual adjustment, can accurately control the fluid flow rate, is suitable for small-caliber pipelines, is convenient to mount, can realize monitoring and management through a remote control system and has a wide applicable range.