The invention discloses a device for measuring tilting and deformation of a foundation pit enclosure structure. The device comprises a reflective sheet, a right angle iron sheet and an expansion bolt, wherein the reflective sheet is fixedly arranged at the outer side of the vertical surface of the right angle iron sheet, a bolt hole is formed in the transverse surface of the right angle iron sheet, and the expansion bolt is vertically connected with the transverse surface of the right angle iron sheet through the bolt hole. The device has the advantages that the structure is simple, the convenience in installation and use is realized, the measuring accuracy is high, the easiness in damage is avoided, the restoration is easy, the normal collection of monitoring data of the tilting and deformation of the foundation pit enclosure structure is guaranteed, and the defect of disability of continuously collecting the monitoring data after a tilting measurement pipe in the prior art is blocked or damaged is avoided.