The utility model provides an automatic scrape machine of coming out, relates to and scrapes the quick -witted technical field of coming out, and including loading attachment, white washed wall device and control system, the white washed wall device includes the guide rail, removes frame, feed cylinder, spatula, tripper, branch material hose, moving motor, stretches and draw motor and rail brackets. Including following step to adjust the distance and the depth of parallelism of spatula and wall, the exhaust, then shut the gas vent on the piston and open the discharge gate and lead to on feed tube puts through the tripper, move the downside that the guide rail was adjusted to the frame, stretch the pull rod of stretching that draws the motor upside to adjust the state that is in the extension, open hydraulic pump and moving motor, when the spatula is located the top of wall body, will stretches the pull rod and adjust the taut state that is in, moving motor reverse rotation is controlled to control system time -out hydraulic pump shutdown feed, removes the frame and moves down, when the removal frame returns, repetitive operation. The utility model discloses work efficiency is high, and the material loading is even, and the floating roughness of wall is high, and degree of automation is high.