The utility model provides a grab finger type subsea tree mounting tool, includes the collar of arc structure, the collar be four and circularly symmetric set up, the collar with the apron fixed connection it indicates the driving cylinder and is located the spring protective housing of grabbing finger driving cylinder both sides all to be provided with grabbing in the middle of being located on the collar, inside spring and the spring beam of being provided with of spring protective housing, the one end and the apron of spring beam pass through bolted connection, the other end of spring beambe provided with with each other matched with spring uide bushing of spring, grab inside being provided with of finger driving cylinder and grab finger drive RAM, grab and indicate drive RAM one end and apron bolted connection, grab the stripper loop that indicates to be provided with on the drive RAM positioning action, it is fixed that the stripper loop passes through the stripper loop retainingring, the top that indicates the driving cylinder of grabbing be provided with and grab the finger, grab the finger through locking driving head joint grab indicate drive RAM on, the quick unblock that indicates locking mechanism realizes grabbing, the redundancy design of implementation tool increases the reliability of instrument.