In order to screen low-temperature and high-efficiency cellulose-degrading fungi，39 soil samples were collected from the wheat-maize double cropping fields in Shijiazhang，Xingtai，Tangshan in Hebei Province. The size of the transparent circle of the straw degradation fungi were screened by Cellulose sodium-Congo red medium at 10℃. By comparing the filter paper enzyme activities，a low temperature cellulose degrading fungi SDF-LT was found. Based on the morphology and ITS phylogenetic analysis，the fungi were identified as a strain of the genus Pseudogymnoascus. Sandbag method under natural low-temperature conditions was used to determine the straw degradation ability of the strains SDF-LT. The degradation rate of this strain was 42.67% at 80 days after inoculation，which was significantly higher than that of the normal temperature inoculants and control. At 80 days，the content of cellulose，hemicellulose，and lignin in maize straw treated with SDF-LT were 26.79%，28.52%，4.41% respectively，which were significantly lower than those of normal temperature straw degrading bacteria and control. Using scanning electron microscopy，it was found that the original fiber bundle structure of straw treated by SDF-LT was broken，and the fiber structure was highly damaged. The screened strain SDF-LT provided strain resources for the maize straw degradation.