The invention discloses a centrifugal-type tree protectant spray brushing machine which consists of three major parts, including a driving system, a protectant supplying system and a centrifugal-type spray brushing system. A protectant storage tank (1) and a driving motor (3) are installed on a cart (17), and a transmission soft shaft (5) is driven by the driving motor (3) to form two branches at a transmission shunt chamber for the purpose of respectively driving two groups of four centrifugal throwing rollers (7, 8) which are mutually connected in series; a material supplying pump arranged inside the protectant storage tank (1) is used for conveying a protectant to a flow control valve through a conveyance hose (4), the protectant is then divided into two branches which respectively fall, through a flow guide opening on a guide protective shield (12), onto the surfaces of the centrifugal throwing rollers (7, 8) rotating at a high speed, and the protectant is spray-brushed on the trunk at a certain initial speed under the action of centrifugal force. The centrifugal-type tree protectant spray brushing machine of the invention has the characteristics of strong self adapting capability, high working efficiency, simpleness in operation and the like, and can be used for spray-brushing the tree protectant on the trunk during park and garden maintenance.