The invention relates to the technical field of dispensing machine equipment, in particular to an SMT paster high-speed dispensing machine which comprises a machine frame body, an X-direction translation mechanism, a Y-direction translation mechanism, an injection head and a board conveying workbench. The Y-direction translation mechanism comprises a Y-direction driving mechanism, a Y-axis slidingrail and a V-direction translation base arranged on the Y-axis sliding rail, the injection head comprises a head base and an injection valve arranged on the head base, and a heating assembly is arranged below the board conveying workbench and comprises a heating body arranged on the machine frame body. Ventilation holes are uniformly formed in the top of a hot air chamber, hot air is uniformly blown onto a PCB, so that the PCB is uniformly heated, local heating of the PCB is avoided, adverse effects of thermal expansion and cold contraction of the PCB on electronic components are reduced, andthe product qualification rate of the PCB is improved.