The invention specifically discloses a sampling and metering device for liquefied petroleum gas, belonging to the technical field of petroleum equipment. The sampling and metering device comprises a hollow main sampler body and a visible liquidometer, wherein the two ends of the main sampler body are provided with pipe joints; a rubber sleeve is arranged between and sleeves each pipe joint and themain sampler body; each pipe joint is threadedly connected with a sampler valve; each sampler valve comprises a valve body and a valve stem, a threaded blind hole is formed in the inner bottom of thevalve body, and a valve core hole is formed in the inner top of the valve body; the visible liquidometer comprises a main body framework of the liquidometer; the main body framework of the liquidometer is arranged on the main sampler body; the main sampler body is provided with a glass tube and a graduated scale corresponding to the glass tube; and the glass tube is communicated with the main sampler body, thereby forming a communicating vessel structure with the main sampler body. The sampling and metering device has the advantages of reliable sealing performance, convenience in on-site detection of the quality of liquefied petroleum gas in a gas filling station, and capacity of improving the detection efficiency of liquefied petroleum gas.