The invention discloses a field surface irrigation device. The field surface irrigation device comprises a water suction pump, wherein the water suction pump is connected with a water conveying main pipeline; a first gate valve, a filtering device, a water and fertilizer mixing device and a second gate valve are sequentially arranged on the water conveying main pipeline; a plurality of detachable branch pipelines are arranged on the water conveying main pipeline below the water outlet end of the second gate valve; a sub-control valve is arranged on each branch pipeline; the lower end of each branch pipeline is connected with a transverse field-in pipe; a plurality of gates are arranged at the side edge of each field-in pipe; the distance between the gates are consistent with the field distance; and a flow detector is arranged at the water outlet of each gate. The field surface irrigation device further comprises a temperature and humidity sensor, and the temperature and humidity sensor, the flow detector, the first gate valve, the second gate valve, the sub-control valve and the gates are in signal connection with a controller. The field surface irrigation device can supply both water and fertilizers during irrigation, saves manpower, material resources, water resources and time, greatly meets nutrition demands for crop growth, and facilitates automatic management.