Provided is an anti-binding weeding machine, comprising ejection blocks (46), a limiting plate (49), a ventilating slot (50), an air baffle sheet (10), a power unit (8), an intermediate gear (16), a rotatory elliptic ring (17), a rotatory gear (18), a rotatory ring (15), a first transmission gear (24), a third transmission gear (26), a second transmission gear (25), and a lateral-shift guide rail (14). The use of ejection blocks (46), the limiting plate (49), the ventilating slot (50) and the air baffle sheet (10) between an upper transmission inner rod (11) and a lower transmission inner rod (9) on the weeding machine prevents the power unit (8) from burning out when blades are bound with grass; friction between the ejection blocks (46) and the limiting plate (49) will not cause overheating of said ejection blocks (46) and limiting plate (49); and the use of structures such as the intermediate gear (16), the rotatory elliptic ring (17), the rotatory gear (18), the rotatory ring (15), the first transmission g
