The invention discloses a swinging switching device for a water delivery pipeline of a field irrigating machine. The swinging switching device comprises a fixing plate, wherein fixing seats are arranged on one side of the front surface of the fixing plate; a guiding groove is formed in each fixing seat; a side plate is arranged at the upper part of the fixing plate; a rotating mechanism is arranged on the side plate; the rotating mechanism comprises a rotating disk; the rotating disk is mounted on the side plate through a mounting shaft; an adjusting column is arranged on one side of the rotating disk; a moving shaft is arranged between the fixing seats; meshing teeth are arranged on the surface of the moving shaft; pistons are arranged at the end parts of the moving shaft; an adjusting block is arranged at the front part of the side plate; an adjusting groove is formed in the adjusting block; the adjusting column is in clamping connection to the position of the adjusting groove; a positioning shaft is arranged at the front part of the side plate; a positioning pipe is arranged on the adjusting block, and sleeves the outer periphery surface of the positioning shaft; a tooth disk is arranged at the lower part of the adjusting block; a tooth groove is formed in the lower part of the tooth disk; and the tooth groove is meshed with the meshing teeth. According to the swinging switching device disclosed by the invention, the water delivery pipeline can be conveniently controlled to close or open.