The Assembly originated in 1828 as the General Council of the Province in the Casa da Junta, which had limited legislative power.

16 of 12 August 1834, the Legislative Assembly of São Pedro do Rio Grande do Sul began to operate on 20 April 1835.

However, the Ragamuffin War, which initiated in September of the same year, prompted the Assembly to go into recess until 1 March 1845, briefly reactivating between October and November 1837.

With the 1935 State Constitution, it was reduced to a Permanent Commission of 7 members, and on 10 November 1937, Getúlio Vargas decreed the Estado Novo and closed all the legislative houses.

[6][7] The Legislative Assembly has Standing and Temporary Committees, technical bodies destined to conduct studies and provide specialised reports.