The invention discloses a nuclear magnetic resonance gyroscope device for improving atomic polarization uniformity. The device comprises an atomic vapor chamber, a non-magnetic heating device, a magnetic shielding device, a three-dimensional magnetic field coil, a pump light laser, a first polarizer, a first lambda/4 wave plate, a second lambda/4 wave plate, a first reflector, a probe light laser,a second reflector, an acousto-optic modulator, a diaphragm, a second polarizer, a lambda/2 wave plate, a Wallstone prism, a differential photodetector, a first lock-in amplifier, a second lock-in amplifier, and a computer. With the device of the invention adopted, the problem of the non-uniformity of atomic polarization in a nuclear magnetic resonance gyroscope can be solved, and a guarantee isprovided for improving the detection sensitivity of the nuclear magnetic resonance gyroscope.