The invention discloses a lubricating oil sampling device which comprises a sampling system and an oil production system; the sampling system and the oil production system are connected through a sampling pipeline; an oil pump is arranged on the sampling pipeline; the sampling system mainly comprises a steel ball head; a filter screen is arranged in the steel ball head; a rubber plug is arranged on a rubber tube. The lubricating oil sampling device further comprises a control system; the control system comprises a meter control main board, an encoder and an indicating device; the encoder and the indicating device are respectively connected with the meter control main board; the oil pump is connected with a motor; the motor is also connected with the meter control main board. The oil pump is also connected with a flow rate measuring converter; then the flow rate measuring converter is connected with the encoder. The lubricating oil sampling device disclosed by the invention better solves the problem of pollution caused as lubricating oil is mixed with water vapor or other gases in air when the lubricating oil is sampled and meanwhile avoids the pollution to an oil sample in a crude oil tank or an oil drum self in the sampling process; in addition, the lubricating oil sampling device also solves the problem of imprecise control on lubricating oil quantity in the lubricating oil sampling process.