The utility model discloses a survey reflect meter for foundation ditch horizontal displacement and subsiding, including the pre -buried vertical sleeve pipe that upwards stretches out the retaining wall on retaining wall top and upper portion of fixing in lower part, the cover intraduct is equipped with supporting platform, and supports in the lower part inserted casing of the round bar of sleeve pipe looks adaptation and by supporting platform, and open the position that the fixed reflection of light piece of radial intermediate position at the top of round bar, sleeve pipe lie in the supporting platform top has the screw, and screw construction bolt, bolt can revolve to the lateral wall of its rod end with the round bar and offset. If meet and survey when the barrier appearing between reflect meter and certain measuring apparatu of surveing the position, can be again with surveing the region that does not have the barrier between selected extremely its and this the observation reflect meter in position, unscrew the bolt on the sleeve pipe after that to the piece that will reflect light is adjusted to its reflection of light face and measuring apparatu on the new observation position relatively, and then tighten the bolts sets up the round bar, can carry out this observations reflect meter and belong to the foundation ditch horizontal displacement in region and the monitoring of subsiding.