The invention discloses a double-suction type centrifugal ventilation fan. Centrifugal fan technologies in China still need to continue to improve, so as to enhance the stability of operation of fans, increase the efficiency of operation of the fans and lower the power consumption of the fans. According to the double-suction type centrifugal ventilation fan, a flow baffle is arranged at an outlet of a volute; two blade groups are symmetrically arranged at the two sides of a wheel disc; each blade group comprises a plurality of long blades and short blades; the long blades are uniformly distributed along the circumference, and a short blade is arranged between every two adjacent long blades; the inner end faces of the long and short blades are all welded to the wheel disc, and the outer end faces of the long and short blades are all welded to the inner ends of two wheel covers; the outer end of each of the two wheel covers is welded to a forward guider; bladeless pressure expanding edges are arranged at the edges of ends, welded to the long and short blades, of the wheel covers; the rim of the wheel disc is a spherical surface; a plurality of resistance reduction grooves which are equidistantly arranged along the axial direction of the wheel disc are formed in the internal sidewall of the volute. The double-suction type centrifugal ventilation fan has the advantages that the static pressure-flow characteristic and efficiency-flow characteristic of the existing double-suction type centrifugal ventilation fans can be improved, and thus, the pneumatic performance of the existing double-suction type centrifugal ventilation fans is improved.