The invention discloses a compact countercurrent water cooling plate apparatus and relates to a cooling apparatus for a server. The apparatus comprises an upper cover, a sealing fin and a lower cover; the upper cover is connected with the lower cover; the sealing fin is arranged between the upper cover and the lower cover; the apparatus is characterized in that a middle water guide column is arranged in the middle of the upper cover; the lower cover is provided with a plurality of fins; and the sealing fin is provided with a water outlet channel for limiting water flow to flow through the fins from the middle water guide column. According to the apparatus, water is fed in a middle upward spraying mode; the water flow is dispersed to the edge of the lower cover and is upwards concentrated to the upper cover for discharge; finally the water flow is collected and guided out of a water cooling plate; the fins and the upper cover are directly added with the sealing fin; an elastic material is adopted, so that the structural tolerance between the fins and the upper cover is made up for and a gap between the fins and the upper cover is filled; the heat exchange efficiency of the water cooling plate is improved, so that a heating device with high power consumption density can be adapted; and the structural area of the water cooling plate is reduced, thereby facilitating system layout design.