The sampling equipment for groundwater monitoring is divided into bucket sampler, inertial sampler, gas-driven sampler and the submersible pump sampler in foreign countries. The bucket sampler has the features of simple technical principle, easy-making, low cost and wide application range and is less affected by the monitoring well diameter and the sampling depth; the inertial sampler has small diameter and can be used in small diameter monitoring well with sampling depth up to 90m; the gas-driven sampler has complex structure and wide application range, which is suitable for most groundwater monitoring wells with high efficiency; the submersible pump sampler is the most effective one in these four.