The invention provides an automatic painting device, belongs to the technical field of machinery and is used for solving the problems of non-uniform painting and serious waste caused by a manual painting mode of an existing painting device. The automatic painting device comprises a fixed plate, a plurality of liquid level columns, communication pipes and quick painting heads, wherein the liquid level columns and the communication pipes are vertically arranged on the fixed plate; a painting tray is arranged on the fixed plate; the quick painting heads are arranged on the painting tray; the communication pipes, the liquid level columns and the quick painting heads are communicated with one another in a one-to-one correspondence manner; each liquid level column is provided with a liquid level switch which is used for controlling the liquid level of the corresponding liquid level column; each communication pipe is provided with an electromagnetic valve which is used for controlling closing of the corresponding communication pipe. The automatic painting device has the advantages of simple structure, uniform painting and wide application range.