A Horizontally-symmetrical and wide-range rice seedling system for a rice seedling thrower, comprising: a rice seedling conveying device (2) and rice seedling throwing devices (3) provided on a rice seedling thrower rack (1). The rice seedling throwing devices (3) are symmetrically provided on both sides below the rice seedling conveying device (2). Starting ends of the rice seedling throwing devices (3) are located below the tail end of the rice seedling conveying device (2). The rice seedling conveying device (2) comprises several groups of first transmission wheels (21), second transmission wheels (23), and rice seedling conveying belts (22). The several groups of rice seedling conveying belts (22) are all provided on a same plane. The rice seedling throwing device (3) comprises a drive component (31), a steering transmission component (36), a first transmission shaft (32), a second transmission shaft (33), a first rice seedling throwing belt group (35), and a second rice seedling throwing belt group (34). The first rice seedling throwing belt group (35) and the second rice seedling throwing belt group (34) each comprise several groups of third transmission wheels (341), fourth transmission wheels (343), and rice seedling throwing belts (342). The third transmission wheels (341) are provided on the first transmission shaft (32) and the second transmission shaft (33), separately. One end of the first transmission shaft (32) is connected to the steering transmission component (36), and the other end thereof is connected to the drive component (31). One end of the second transmission shaft (33) is connected to the steering transmission component (36). The present system can achieve the formation of multiple rows of rice seedlings with appropriate intervals at one time, and is highly efficient.La présente invention concerne un système de semis de riz à large plage et à symétrie horizontale pour un lanceur de semis de riz, comprenant : un dispositif de transport de se
