The invention relates to a lateral contraction type stirring paddle for a coating reaction kettle, comprising a paddle frame (1), wherein an electric device (2) at the upper part of the paddle frame (1) is located at the outer end of the coating reaction kettle; a main paddle part comprises a lifting stand column (3), a material scraping structure (4), telescopic stirring wings (5) and a storage bin (6); a rotary dispersing disc (7) is arranged at the bottom, a main control device (8) is located at the outer side of the reaction kettle; when in use, rotary stirring and uniform mixing or dispersing mixed operation is performed aiming at a medium according to reaction requirements, and the stirring wings (5) are collected into the storage bin (6) when the operation state is different; a prompting device (9) is arranged so as to achieve different prompts for two operation devices in the reaction kettle; the stirring wings (5) are designed in a staggered mode, two wings share one storage bin (6) and are controlled by the main control device (8); and the lateral contraction type stirring paddle is diversified in function design, can effectively perform horizontal or longitudinal stirring or fusing operation aiming at the medium, and can implement man-made monitoring and adjustment, and thus ensuring sufficient reaction and having a relatively strong practicable function.