Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display device

The present invention provides a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display device. The liquid crystal alignment agent comprises at least one polymer selected from the group consisting of polyamic acids and polyimides and a solvent comprising a pyrrolidone derivative (p) shown in a formula (1). In the formula (1), R1 is a C3-5 hydrocarbon group, and the carbon chain of the hydrocarbon group can contain an oxygen atom.