A deep well pump, especially a numerically controlled reciprocating submersible pump with freely adjustable parameters, includes a balancing sieve tube, a drive and a pump. The drive includes a stator with airtight cavity and reciprocating head with iron cores inside the stator. The stator and the reciprocating head form a friction couple via supporting guides and the reciprocating head iron cores. The stator's upper end is connected to the pump's lower end through the sieve tube. An oil tube is connected to the pump. The stator's lower end is connected to the balancing sieve tube, end plug and end coupler serially.