The experimental study of the engineering properties for 3D printing concrete materials used in pile foundation engineering is carried out. 42.5R rapid hardening sulphoaluminate cement,smalldiameter construction dry sand and gravel are used as the main materials. Through the slump test and compressive strength test,it shows that the larger the water-cement ratio is,the larger the slump of material is;when the sand rate is larger,the slump of the material decreases firstly and then increases. Finally,when the water-cement ratio is 0.39 and the sand rate is 0.536,the fluidity is relatively good;at the same time,the setting time of the material is controlled by adding sodium gluconate retarder. When the proportion is 0.71%,the material can maintain a longer time plasticity,which is beneficial to the better control of the setting time of the concrete after mixing. By adding polycarboxylate superplasticizer,it can increase the fluidity and compressive strength of the material,the addition ratio0.48% is the best. Through a series of laboratory tests,a new type of concrete material suitable for 3D printing of pile foundation engineering is given.