The invention relates to a sand production rate measurement method and device suitable for producing thick oil in oil-field. The measurement method comprises: detecting the diluent thick oil passing through a Venturi tube using a gamma-source sensor; obtaining the percentage of the solid-phase sand in the diluent fluid amount; calculating the content of the solid-phase sand in the thick oil. The measurement device comprises an oil-transportation main tube, a stirrer inside the oil-transportation main tube, a diluent input pipe communicated on the oil-transportation main tube corresponding with the stirrer position, a switch valve and a metering pump on the diluent input tube, a Venturi tube connected with the downstream tube section of the oil-transportation main tube, a first pressure sensor mounted on the upstream straight tube section of the Venturi tube, a second pressure sensor mounted in the middle throat section, a set of three energy-level gamma-source and gamma detector correspondingly mounted on the tube wall of the downstream straight tube. The measurement method has novel design, simple structure, suitable for oil-field especially for production of thick oil.