A high sensitivity NMR magnetometer is realized by laser pumping in this paper. In this scheme,87Rb-129Xe atoms are used as the working material, a resonance laser is used to polarize the reactive alkali metal atom87Rb, and then to polarize the nucleus of129Xe by means of spin exchange collision.Under the action of fixed magnetic field and driving magnetic field, the macroscopic magnetic moment of atoms precesses, and the precession frequency is proportional to the fixed magnetic field.When there is an external magnetic field in the direction of the fixed magnetic field, the precession frequency detected will change, and the magnetic field can be accurately measured by the change of precession frequency. We tested the magnetometer from the sensitivity, linear responsiveness and resolution.Result shows that the magnetic sensitivity was 0.28 pT/Hz1/2 (@1 Hz), the resolution was better than 0.171 nT, and the non-linearity was 0.662 6%.