The invention provides an oil and gas well sand production monitor. The oil and gas well sand production monitor is composed of a sand production monitoring channel, a noise monitoring channel and a data collecting and processing system. The invention further provides an oil and gas well sand production monitoring data processing method. The data collecting and processing system is used for synchronously collecting output signals after smoothing of the sand production monitoring channel and the noise monitoring channel, the signals are compared so that noise can be eliminated, a pure sand production signal rsp(i) is obtained, and the sand production rate Mt and cumulative sand production amount M in unit time are obtained. The problem that in the prior art, the noise characteristics cannot be measured and distinguished specially during sand production monitoring is mainly solved. Through the calculation of the sand production amount, the purposes that parameters of oil production or gas production are guided to be adjusted in time, proper sand production is ensured, the capacity of oil and gas wells is increased and the productive life of the oil and gas wells is prolonged are achieved.