The invention discloses a sliding door, a cab including the sliding door and an engineering machine. The sliding door comprises a door frame, a door plate and a sealing assembly arranged between the door frame and the door plate, wherein the sealing assembly comprises a brush and a rubber strip, the brush is close to an external space of the sliding door, and the rubber strip is close to an internal space of the sliding door. On one hand, the door frame can be in flexible contact with the door plate through the brush arranged between the door frame and the door plate, sliding of the sliding door is not affected, and sliding smoothness of the sliding door can be ensured; on the other hand, the brush and the rubber strip form a dual-sealing structure, the brush close to the external space of the sliding door plays wind-proof, dustproof and snow-proof effects and the rubber strip close to the internal space of the sliding door further plays a waterproof effect to tightly seal guiding rails between the door frame and the door plate, upper and lower guiding rail sealing during vehicle door closing is achieved, and the good wind-proof, dustproof, snow-proof and waterproof effects are played. In addition, the whole structure is safe, reliable, low in cost and convenient to maintain and replace.