The invention discloses a high-performance sliding window. The sliding window includes a window frame and pushable casements in the window frame; the window frame includes a head, a sill and lateral jambs fixedly connected to the head and the sill; each pushable casement consists of hooks, stiles and top and bottom rails slidingly connected with the head and the sill; the top and bottom rails arefixedly connected with the hooks and the stiles, and each hook comprises a fixing hook body and a fixing hook material fixedly connected with the fixing hook body; plastic gaskets are arranged on headsliding rails of the head and sill sliding rails of the sill at intervals, and lower elastic sliding rail sheets are arranged on the plastic gaskets between the sill sliding rails. The high-performance sliding window has the advantages that more convenience is provided for drainage, the sealing performance is great, and the thermal insulation and heat preservation effects are great.