According to Official Guinness Records,
The largest piggy bank is 8.03 m (26 ft 4.3 in) long and 5.58 m (18 ft 3.7 in) tall and was achieved by Kreissparkasse Ludwigsburg (Germany), in Ludwigsburg, Germany, on 18 May 2015. The piggy bank also had a circumference of 17.87 m (58 ft 7.5 in) and was 5.54 m (18 ft 2 in) wide. Money was inserted into the piggy bank using a small crane, carrying each coin to the slot one by one after inserting it into a smaller piggy bank at the bottom of the crane.
For a complete list of 2015 records, please visit 2015 Guinness Records in Germany.