The invention discloses a rice field 
milk vetch sowing-free circulation seed reserving method. The method comprises the following steps that after 
milk vetch seeds are mechanically harvested in early and mid May, smashed 
milk vetch straws are evenly spread in a rice field, 
irrigation is conducted, a drainage outlet is blocked (so as to prevent milk vetch seeds reserved in the rice field from flowing away along with water), 
biodegradation is conducted for five to ten days, dry farming is conducted to achieve single-season rice 
transplantation or single-season rice no-
tillage direct 
sowing, the single-season rice is irrigated by shallow water at the early growth stage, water falling and field 
drying are conducted at the 
rice milk-ripe stage, the single-season rice is harvested from the mid and late September to early October, high stubbles of straws are reserved to be returned to the field, or removed from the seed reserving field within one to three days, ditching or 
ditch cleaning is conducted, and no water is reserved in the field in sunny days or accumulated in rainy days; routine management of milk vetch planting is conducted, and circulation operations of farming work such as milk vetch seed mechanical collection and single-season rice 
sowing are conducted in the next early and mid May. The rice field milk vetch sowing-free circulation seed reserving method solves the problems that at present, field abandonment is general in winter in the single-season rice field, and rice field 
green manure milk vetch seeds are scarce, and relieves milk vetch seed shortage, increases milk vetch seed reserve, and achieves the effect of returning milk vetch straws for fertilizing rice 
field soil.