The invention provides a sliding window with sealing parts. The sliding window comprises a window frame, an inner window sash and an outer window sash. The first sealing part and the second sealing part each in a right-angle triangle shape are arranged at the corresponding positions of a first inner slide way and a second inner slide way respectively. A slope of the first sealing part and a slope of the second sealing part are oppositely arranged. The third sealing part and the fourth sealing part each in a right-angle triangle shape are arranged at the corresponding positions of a first outer slide way and a second outer slide way respectively. The fifth sealing part matched with the first sealing part is arranged at the upper end of the inner window sash. The sixth sealing part matched with the second sealing part is arranged at the lower end of the inner window sash. The upper end of the outer window sash is connected with the first outer slide way in a sliding mode. The lower end of the outer window sash is connected with the second outer slide way in a sliding mode. The seventh sealing part matched with the third sealing part is arranged at the upper end of the outer window sash. The eighth sealing part matched with the fourth sealing part is arranged at the lower end of the outer window sash. Good sealing performance is achieved, and heat/cold leakage losses caused by gaps are reduced.