The invention relates to an automatic robot for breaking ceramic tiles on a building wall surface. The automatic robot comprises a cleaning supporting plate and a cleaning device, wherein an annular sliding groove is formed in the upper end of the front side of the cleaning supporting plate, and the cleaning device is installed on the left side face of the cleaning supporting plate; the cleaning device comprises a cutting adjusting mechanism, a cutting mechanism and a cleaning mechanism; and the cleaning mechanism comprises a cleaning motor, a cleaning rotating plate, a cleaning sliding groove, a cleaning sliding rod, a drilling cylinder, a rotary drilling rig, a cleaning branched chain, a suction push rod, a suction connecting plate, a suction sucking cup and an air pump. The automatic robot can solve the problems of low working efficiency, danger of manual cutting of the ceramic tiles, need of marking the ceramic tiles firstly, inability to accurately control the cutting depth of theceramic tiles, need of manual hooking of the cut ceramic tiles and easy scratching of hands by manual picking of the cut ceramic tiles existing in the existing cleaning of the broken ceramic tiles onthe wall surface.