The invention discloses an environment-friendly quadruped robot for a building. The environment-friendly quadruped robot for the building comprises a frame; a main motor is arranged at the lower partof the front end of the frame; a running output shaft is rotationally connected to the main motor through a gear; a first crank and a second crank are respectively connected to the two ends of the running output shaft; the difference between initial rotation angles of the first crank and the second crank is 180 degrees; one group of running parts is respectively arranged on the two sides of the frame; the running parts comprise first supporting rods, second supporting rods, first connecting rods and second connecting rods; the outer ends of the first cranks are connected to the middle parts ofthe first supporting rods; the upper ends of the first supporting rods are rotationally connected with the first connecting rods; and the second supporting rods are rotationally arranged on the sidewall of the rear end of the frame. According to the environment-friendly quadruped robot for the building, the running parts on the two sides of the frame are driven to move only by using one main motor so that the running function can be realized, the structure is simple and the design is novel.