The invention discloses a paddy field beater. The paddy field beater comprises a gearbox and a middle rack assembly; cutter shaft transmission cases are symmetrically arranged at the left side and theright side of the middle rack assembly, and folding assemblies are symmetrically arranged at the left side and the right side of the middle rack assembly; the output ends of the gearbox are connectedwith the input ends of the cutter shaft transmission cases, and the output ends of the cutter shaft transmission cases are connected with the input ends of the folding assemblies through clutches; each folding assembly comprises folding drive mechanisms, a blade, rack side plates and a folding rack, wherein the rack side plates are fixedly connected to the middle rack assembly, the clutch blade is supported on the folding rack, folding rack plates are fixed to the folding rack and are in pivot connection with the rack side plates, and the folding rack plates and the rack side plates are connected through the corresponding folding drive mechanisms. The folding mechanism of the paddy field beater is high in strength and rigidity, capable of bearing large impact loads and not prone to damage, an oil cylinder drives the folding mechanism to turn over through a rack and pinion mechanism, and the paddy field beater has the advantages of being simple in structure and low in fault rate.