The invention relates to a pesticide spraying device with an anti-freezing function and used for landscape gardening. The pesticide spraying device comprises a body, a pesticide tank, a pesticide spraying pipe and a nozzle. The pesticide tank in a cuboid shape is arranged at the bottom of the body, the pesticide spraying pipe is perpendicular to the bottom end of the pesticide tank, the top end ofthe pesticide spraying pipe is arranged at the bottom of the pesticide tank, and the nozzle is mounted at the bottom end of the pesticide spraying pipe and communicated with the pesticide tank through the pesticide spraying pipe. The body is provided with a flight system, a stirring mechanism is arranged in the pesticide tank, and an anti-freezing mechanism is arranged in the body. The pesticidespraying device with the anti-freezing function and used for landscape gardening has advantages that a pesticide liquid stirring function is realized, uniformity of pesticide distribution in pesticideliquid is improved, and influences on efficacies due to pesticide liquid precipitation are avoided; in addition, owing to the anti-freezing mechanism, an anti-freezing function is realized.