The invention discloses a gradient device and system for magnetic resonance imaging equipment, and the device comprises a cylinder; gradient coils which are disposed in x, y and z direction of the cylinder. The gradient coil in the z direction is wound in the peripheral direction of the cylinder, and the gradient coil in the x direction comprises a first x gradient coil and a second x gradient coil. The first and second x gradient coils are symmetrically disposed at two sides of a first plane, and the first plane passes through the axis of the cylinder, and is perpendicular to the x direction. The gradient coil in the y direction comprises a first y gradient coil and a second y gradient coil, wherein the first y gradient coil and the second y gradient coil are symmetrically disposed at two sides of a second plane, and the second plane passes through the axis of the cylinder to be perpendicular to the y direction. According to the invention, the device can achieve the higher magnetic field intensity in an imaging space through a smaller current in the gradient coils, and improves the switching rate of a gradient system.