Belonging to the technical field of electronic components, the invention provides a cleaning agent coating mechanism. The mechanism comprises a cleaning agent coating component and a cleaning agent ejection component. A cleaning agent box mounting plate of the cleaning agent coating component is disposed on a cleaning agent box guide sliding plate and can slide back and forth, a first cleaning agent box and a second cleaning agent box are installed on the cleaning agent box mounting plate side by side, one end of a cleaning agent replacement cylinder is connected to a cleaning agent box mounting plate connecting frame, an ejection motor and an ejection wheel of the cleaning agent ejection component are in coaxial connection, the ejection wheel is rotatably disposed on an eccentric ejectionshaft, a cleaning agent ejection sliding block is disposed on a cleaning agent ejection guide rail and can slide up and down, a cleaning agent ejection sliding plate is installed on the cleaning agent ejection sliding block, an ejection roller is inserted into an ejection roller slot at the lower end of the cleaning agent ejection sliding plate, and cleaning agent ejection suction nozzles are mounted on the cleaning agent ejection sliding plate. The cleaning agent coating mechanism provided by the invention can coat a mounting electronic clip with a cleaning agent quickly, and the cleaning agent box can be replaced conveniently.