High-power　electromagnetic　transmitter　power　supplies　are　an　important　part　of　deep　geophysical　exploration　equipment.　This　is　especially　true　in　complex　environments,　where　the　ability　to　produce　a　highly　accurate　and　stable　output　and　safety　through　redundancy　have　become　the　key　issues　in　the　design　of　high-power　electromagnetic　transmitter　power　supplies.　To　solve　these　issues,　a　high-frequency　switching　power　cascade　based　emission　power　supply　is　designed.　By　combining　the　circuit　averaged　model　and　the　equivalent　controlled　source　method,　a　modular　mathematical　model　is　established　with　the　on-state　loss　and　transformer　induction　loss　being　taken　into　account.　A　triple-loop　control　including　an　inner　current　loop,　an　outer　voltage　loop　and　a　load　current　forward　feedback,　and　a　digitalized　voltage/current　sharing　control　method　are　proposed　for　the　realization　of　the　rapid,　stable　and　highly　accurate　output　of　the　system.　By　using　a　new　algorithm　referred　to　as　GAPSO,　which　integrates　a　genetic　algorithm　and　a　particle　swarm　algorithm,　the　parameters　of　the　controller　are　tuned.　A　multi-module　cascade　helps　to　achieve　system　redundancy.　A　simulation　analysis　of　the　open-loop　system　proves　the　accuracy　of　the　established　system　and　provides　a　better　reflection　of　the　characteristics　of　the　power　supply.　A　parameter　tuning　simulation　proves　the　effectiveness　of　the　GAPSO　algorithm.　A　closed-loop　simulation　of　the　system　and　field　geological　exploration　experiments　demonstrate　the　effectiveness　of　the　control　method.　This　ensures　both　the　system＇s　excellent　stability　and　the　output＇s　accuracy.　It　also　ensures　the　accuracy　of　the　established　mathematical　model　as　well　as　its　ability　to　meet　the　requirements　of　practical　field　deep　exploration.