After completing his studies, he entered the civil service at the age of 27 in 1705, following his father's example, and was appointed Vice-Chancellor of Bohemia.
Three years later he worked in the same capacity very successfully in the preparation of the election of Charles VI as Emperor.
In 1721, he was Imperial envoy in the 1721 papal conclave of the election of Pope Innocent XIII in Rome.
Also negotiated was a restricted practice of the Protestant faith in the Kingdom of Hungary, for which Kinsky campaigned.
As early as 1720, he had acquired Eckartsau Castle in Lower Austria, which he had remodeled into a magnificent baroque palace based on plans by Joseph Emanuel Fischer von Erlach, under the direction of the imperial architect Christian Alexander Oedtl.