The invention provides a cement perfusion apparatus for construction machinery. The cement perfusion apparatus for the construction machinery comprises a pouring port, a motor, a perfusion box, a fixed bracket, a gas pressurizing pump, a control switch, a pressurizing pipe, a connecting pipe, a perfusion pipe, a spiral rod, a fixed plate and a bearing, wherein the upper end surface of the perfusion box is provided with the motor, the left side of the perfusion box is provided with the pouring port, the right end surface of the perfusion box is fixedly provided with the fixed bracket, the spiral rod is installed on the middle position inside the perfusion box, the lower end surface of the spiral rod is provided with the bearing, the lower end surface of the perfusion box is provided with the connecting pipe, the fixed plate is installed at the inner lower side of the connecting pipe, the left end surface of the connecting pipe is connected with the perfusion pipe, the right end surfaceof the connecting pipe is connected with a pressurizing pipe, the upper end surface of the pressurizing pipe is provided with the gas pressurizing pump, and the front end surface of the fixed bracketis provided with the control switch. By adopting the cement perfusion apparatus for the construction machinery, the problems of poor perfusion effect of the original cement perfusion apparatus for theconstruction machinery can be solved. The cement perfusion apparatus for the construction machinery is reasonable in structure, convenient in use and good in perfusion effect.