The invention discloses an irrigation device for crop planting. The irrigation device comprises a first metal conveying pipe. A second metal conveying pipe is in sleeved connection to the left side ofthe first metal conveying pipe, first grooves formed in the surface of the first metal conveying pipe are in clamped connection with a first T-shaped metal rod arranged on the upper surface of the second metal conveying pipe, a first vertical metal rod and a second vertical metal rod are welded to the side ends of the first metal conveying pipe and the second metal conveying pipe respectively, awater tank is fixed to the upper surface of a transverse metal rod welded to the surface of the right side of the first vertical metal rod, and a water pump fixed to the internal surface of the watertank is connected with the second metal conveying pipe through a first pipe. According to the irrigation device, as the first metal conveying pipe, the second metal conveying pipe, the first T-shapedmetal rod, the first grooves, the water tank, the water pump, the first pipe and the transverse metal rod are arranged, the problems that when the size is large, transportation is inconvenient, and asfor crops with the area being not particularly large, irrigation practicability is not high are solved.