A maize foliage chemical control agent spraying machine with a walking function is used for making it convenient to spray chemical control agents and comprises a walking assembly and a spraying assembly. The walking assembly comprises a frame, a pair of first supporting legs, a pair of second supporting legs, a driving unit and a steering unit. The first supporting legs and the second supporting legs are arranged at the bottom of the frame, and traveling wheels are arranged on lower portions of the first and second supporting legs. The driving unit is arranged on the first supporting legs andused for driving the traveling wheels on the lower portions of the first supporting legs to rotate, and the steering unit is arranged on the second supporting legs and used for driving the second supporting legs to rotate in a horizontal plane. The spraying assembly comprises a first vertical rod, a second vertical rod, spraying rods and nozzles. The first vertical rod is fixed to the frame, the second vertical rod is in slide connection with the first vertical rod, the spraying rods are arranged on the first and second vertical rods, the nozzles are arranged on the spraying rods and connectedwith a water pump through spraying pipes, and the water pump is arranged in an agent tank at the top of the frame. The maize foliage chemical control agent spraying machine with the walking functionis capable of realizing foliage spraying of maize plants in a self-walking process.