The invention belongs to the field of agricultural planting, and particularly relates to a crop planting machine which comprises a framework and rotary wheels. The rotary wheels are arranged at four corners of the framework, and a soil digging mechanism, a watering mechanism, a planting mechanism and a soil burying mechanism are sequentially arranged on the framework; the soil digging mechanism comprises an air pump and an air outlet pipe, the air pump is arranged on the top of the framework, the air outlet pipe is connected with an output end of the air pump, and an air nozzle is arranged at an output end of the air outlet pipe; the watering mechanism comprises a water pump and a water pipe, the water pump is arranged on the top of the framework, the water pipe is connected with an output end of the water pump, and a conical water outlet is connected with an output end of the water pipe; the planting mechanism comprises a seed feed inlet, the seed feed inlet is formed in the top of the framework, a discharge pipe is arranged at an output end of the seed feed inlet, and a conical discharge outlet is formed in an output end of the discharge pipe; the soil burying mechanism comprises a hydraulic cavity, the hydraulic cavity is connected with the top of the framework, a roller is connected with a piston end of the hydraulic cavity, and the sectional area of the roller is reduced from two sides to the middle of the roller. The crop planting machine has the advantages that manual seed sowing or planting can be replaced by the crop planting machine, accordingly, the cultivation efficiency can be improved, the cultivation time can be shortened, and the work intensity can be relieved.