The invention provides a wall robot capable of surmounting and tramping obstacles. The wall robot comprises a first bracket and a second bracket which are symmetrically arranged, and driving wheels arranged on the first bracket and the second bracket respectively, a sucker, a draught fan, a first driving device and a control device, the first bracket and the second bracket is connected with a first guide rail mechanism through a second driving device, and the first bracket comprises a fixing bracket, a driving frame and a driven frame; a shear type lifting structure is arranged between the fixing bracket and the driving frame; the driving frame is fixedly connected with the driven frame through a second guide rail mechanism; the driven frame is connected to the fixing bracket through the fixing bracket; the driving wheel, the sucker, and the first driving device is arranged on the driving frame. With such a structure, the wall robot capable of surmounting and tramping obstacle achieves extending on the horizontal plane and lifting on the vertical plane, thus the function of surmounting and tramping obstacles is further achieved.