The invention relates to a pesticide liquid sprayer for terraced orchards, comprising a main body bracket, a left long arm, a right long arm, a left short arm and a right short arm. The bottom of themain body bracket is provided with walking wheels, the left long arm is formed by a plurality of rods in hinged connection, and the left long arm is mounted on one side, close to the left part, of thetop of the main body bracket. The right long arm is formed by a plurality of rods in hinged connection, and the right long arm is mounted on one side, close to the right part, of the top of the mainbody bracket. The left short arm is mounted near the left side of the main body bracket and arranged along the height direction of the main body bracket, and the right short arm is installed near theright side of the main body bracket and arranged along the height direction of the main body bracket. According to the specific topography of a terrace, the left long arm and the right long arm can adaptively adjust the bending form so that a pesticide liquid spray pipe corresponds to different positions of a fruit tree, and at the same time, and the left short arm and the right short arm are usedfor cooperation to enable the pesticide liquid spray pipe to enclose the whole fruit tree, thereby realizing mechanization of pesticide liquid spraying of the terraced orchard and fertilization of foliar surfaces.