The students are now heading to Japan to represent Australia in the Universal Robotics Challenge.

"This was really my first time doing robotics and it felt really good to be the best in Australia," Caleb Jeremy, 11, said.

Most of the students had not had lessons in robotics before they entered the competition and their teamwork was a big part of the win, the school's relieving assistant principal Fiona Sannen said.

"They only had two weeks to plan and put the robot together and code it but they had a lot of fun, and that's part of why they won I think, just being really curious and having a vested interest in the robot," Ms Sannen said.

"We have STEM and STEAM in our classes, it's embedded into the curriculum and we're also teaching a lot of those collaboration and critical thinking skills they need to work together as a team."

Ms Sannen said the teachers and students had not known they would be the only primary school team in the competition but the students "just stood up to the high schools without batting an eye".

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The robot that the students will take to Japan has a mechanical arm that's been programmed to move up and down and a mechanical cog that can shoot rubber bands at different angles with the aim of hitting given targets.

Caleb said the robot can only fire three rubber bands at a time but managed to get the job done.

"We missed a lot but in the end we got all the targets," he said.

While winning the Sydney competition was great, Caleb said his favourite moment came a bit earlier: "On our second try of getting the points when we were all really stressed, one of our friends got a bleeding nose."

Sirapuk said his favourite part was "just having fun and messing around and making something great at the same time".

He said he wants to keep doing robotics in high school next year and eventually wants to be a scientist, engineer or architect.

Jett Wilson, 11, who is also part of the Forest Lodge group said: "I think we make a great team and I'm looking forward to seeing what we can achieve in Japan."