The invention relates to the field of direct-current transmission, in particular to a direct-current transmission converter valve control protection system and a control protection method thereof. The control protection system is formed by an operation system and a hot spare system which are in redundancy. The operation system and the hot spare system comprise a pole control system and valve base electronic equipment communicated with the pole control system respectively, the operation system and the hot spare system are connected with a thyristor triggering monitoring subsystem through optical fibers, and the thyristor triggering monitoring subsystem comprises a thyristor and a thyrustor triggering monitoring unit matched with the thyristor. Protection objects of the protection method comprise a converter valve and the valve base electronic equipment. The action results of the protection method comprise alarm, request switch and request trip. The direct-current transmission converter valve control protection system greatly improves operation stability of the direct-current transmission system, greatly reduces shutdown time and overhaul time of the direct-current transmission system and enables economical benefit advantages of the direct-current transmission system to be fully played.