Pumping well sand-prevention production string

The utility model relates to a sand control production string for a pumping well, which is suitable for a sand production well in the petroleum industry. The tubular column comprises a tubular oil well pump, a sand filtering center pipe and a filtering assembly, the tubular oil well pump is provided with a piston and a pump cylinder, the piston is connected through a sucker rod, the upper portionof the pump cylinder is connected with an oil pipe, the lower portion of the pump cylinder is provided with an oil inlet valve, and the lower portion of the pump cylinder is sequentially connected with a constant-pressure valve, a tail pipe, a sealing pipe and the sand filtering center pipe. Corresponding to an oil layer, a filtering assembly is arranged outside the sand filtering center pipe, a packer is connected to the outer portion of the sealing pipe above the oil layer, a check valve is arranged on the outer portion of the tail pipe, and a screwed plug is arranged at the bottom of the production pipe column. An