The utility model discloses a steel sheet pile underground structure of controllable deformation, including the steel sheet pile that the bilateral symmetry set up, locate the waist rail on the steelsheet pile, locate the support steel between the steel sheet pile of both sides and locate the support stop device at these support steel both ends, it is connected with the steel sheet pile through the waist rail to support stop device, support the round steel pipe of cavity that the ladle was drawn together the steel pipe and was located these steel pipe both ends, support stop device includingthe bolt that is used for the channel -section steel of joint support steel tip and runs through round steel pipe, be connected channel -section steel and waist rail, all be equipped with the round hole that a plurality of confession bolts passed on channel -section steel and the waist rail. The utility model discloses an advantage is this underground structure, and not only stability is high, andcan change the supporting construction interval, control foundation ditch horizontal displacement to can satisfy the deformation requirement of different foundation ditchs, all have good adaptabilityto the various security level's of strutting foundation ditch.