This equates to a visitor increase of 30% compared to 2016.
The cruise season begins on Sunday with the arrival of National Geographic Orion at Skeppsbron.
'This year passengers will spend around €63m, playing a major role for both the tourist industry and the entire Stockholm region,' says Thomas Andersson, ceo Visit Stockholm.
Turnarounds are set to reach a record high too with 75 ships projected to begin and/or end their cruise in Stockholm.
'Stockholm is very popular and counts as one of the "Big five" together with Helsinki, Tallinn, Saint Petersburg and Copenhagen,' says Henrik Ahlqvist, cruise marketing manager at Ports of Stockholm.
New this year are Norwegian Getaway (which is also the largest vessel this year), MSC Fantasia and a New Year cruise by Saga Sapphire
Ports of Stockholm can accept black and grey water from vessels with waste water management facilities available at all berths and offloading of waste water is included in the harbour dues.
In 2016, 80% of vessels offloaded black and grey water during a Stockholm call.