In recent years, with the increase of irrigation area and the decrease of water quota from the Yellow River, several agro-ecological issues, such as water scarcity and soil salinization, are becoming more and more severe. It is important to maintain a farmland ecological environment and soil health. In order to explore soil salinity movement of mulched drip irrigation under different plastic film mulch modes in arid areas, a two-year consecutive experiment was carried out in Shuguang experimental station located in Hetao Irrigation Area. We designed two treatments, including flat tillage with full film mulching (PQ) and flat tillage with half film mulching (PB). Soil moisture and salinity was checked by 5TE sensor. The results indicated that soil salinity was redistributed after drip irrigation. The main desalination area was formed under dripper around 30 cm under the dripper, and salt accumulated towards the outer side of humid area. Soil salinity of the partial film mulching treatment was likely to build up on the surface of the un-filmed soil by evaporation. However, full film mulching treatment could effectively decrease soil salt due to the effects of soil moisture. Under mulched drip irrigation, salt content of different horizontal position from drip irrigation zone showed the same trends of electrical conductivity curve variation, and the variation decreased with the increasing soil depth. Soil electrical conductivity of the surface layer followed the order of 50 cm＞20 cm＞0 cm with the distance from the dripper, and soil conductivity value fluctuated greatly in the soil without film mulching. During the whole growing stages, different film mulching treatment all played a certain desalting effect on the 0—70 cm soil layer, the desalination capacity of partial film mulching treatment was much less than the that of the full film mulching treatment. Soil salt content (SA) of the half film mulching treatment in the two growing seasons was 4.71 mg/hm2 and 9.24 mg/hm2, respectively, and SA of the full film mulching treatment was 12.22 mg/hm2 and 21.55 mg/hm2, respectively. Full film mulching treatment efficiently restrained soil water evaporation, resulted in decreased upward movement of soil salt, and created suitable environment for the growth of crops. The results will provide a theoretical basis for water and salt management under mulched drip irrigation in Hetao irrigaiton district.