The invention relates to the field of preparation of tin-copper alloy powder, in particular to a preparation technology of a tin-copper alloy pole piece. The technology comprises the following steps: melting massive Cu<5>Sn<6>; vertically spraying the molten Cu<5>Sn<6> liquid to the surface of a roller which rotates at a high speed through a nozzle from top to bottom; throwing the liquid into an atomizing chamber at one side through the roller to form liquid drops; blowing the liquid drops to a spray chamber at one side of the atomizing chamber by a high-pressure inert gas from bottom to top in the atomizing chamber; spraying a gas-liquid mixture in the spray chamber to a collecting chamber; pressing the powder into tin-copper alloy foil; and putting the foil into a furnace and introducing a mixed gas of air and argon for sintering, so as to obtain the tin-copper alloy pole piece. The sprayed liquid is smashed through centrifugal force of the rotating roller; and the liquid drops are struck through a high-speed gas and are sprayed again, so that the prepared powder is relatively small in particle size and uniform in particle size distribution. Sintering is carried out by introducing the mixed gas of argon and air to obtain the tin-copper alloy oxide film pole piece, so that the performance of the tin-copper alloy oxide film pole piece is further improved.