The utility model relates to a water injection well well head lacing film device, this water injection well well head lacing film device replaces into the plug nut with the elbow of the peaceful pipe department of water injection well head production pipe line standpipe, the plug nut is twisted in the top of standpipe soon, between plug nut and standpipe, still includes the sealing washer, below the middle part of plug nut, is provided with the test block support, and the test block is installed on the test block support through test block fixing bolt, the utility model discloses water injection well well head lacing film device combines together the test block detection method with water injection well head special construction, realized through determining the technological purpose that average rate of corrosion comes monitoring SRB in producing sewage, in addition, because whole water injection well well head lacing film device installs in the elbow position of the peaceful pipe department of water injection well head production pipe line standpipe, consequently not only expand the installation controlling part that installs, can make the whole mobile liquid of normal injection of placing in of test block in addition, improved monitor effect.