To tackle the problems that the efficiency of manual monitoring is not high，and its monitoring frequency cannot satisfy the requirement of foundation pit monitoring under extreme weather，we test the reliability of an automatic monitoring method，with manual monitoring adopted for regular comparison. The results show that the monitoring values of the static level are similar to those of the electronic level. The resulting curve of the fixed inclinometer is nearly the same as that of the sliding inclinometer，and the curve shape is consistent with site construction conditions. The automatic monitoring has good reliability in foundation pit monitoring. For foundation pits subject to complex stress states and frequent bad weather，automatic monitoring should be the first choice for their monitoring in the case of a controllable cost.