The invention provides a motor stator, a motor, a compressor and refrigeration equipment, the motor stator comprises a stator body and a sound absorption device, the stator body comprises a yoke part and a plurality of tooth parts, the yoke part is provided with a first end face and a second end face which are opposite, the plurality of tooth parts are arranged at intervals along the circumferential direction of the inner side wall of the yoke part, and the first end face and the second end face are opposite to each other. Stator grooves are arranged between adjacent tooth parts, and the outer side wall of the yoke part is provided with trimming grooves penetrating through the first end face and the second end face. The sound absorption device comprises a sound absorption plate, and a plurality of sound absorption holes are formed in the sound absorption plate; the sound absorption plate is arranged on the first end face of the yoke part, and/or the second end face of the yoke part, and/or in at least one trimming groove, and a cavity communicated with the sound absorption hole is reserved between the sound absorption plate and the corresponding mounting face on the yoke part. According to the motor stator, the motor, the compressor and the refrigeration equipment, fluid noise generated when a refrigerant flows through the motor can be effectively reduced, and the noise reduction effect is improved.