AR projection lens and AR device

The invention provides an AR projection lens and AR equipment. The AR projection lens comprises a first lens with negative focal power, the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface; the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a convex surface; the first side surface of the third lens is a concave surface, and the second side surface of the third lens is a concave surface; the first side surface of the fourth lens is a concave surface, and the second side surface of the fourth lens is a convex surface; a prism; and the fifth lens has focal power. The distance T45 between the fourth lens and the fifth lens on the optical axis and the distance TD between the first side face of the first lens and the second side face of the fifth lens on the axis meet the following relation: 0.6 gt; t45/TDgt; and 0.4 part. According to the invention, the problem of poor compactne