Spokesmen for a national black advocacy group for the elderly announced plans yesterday to persuade the Reagan administration to reconsider proposals to reduce the federal budget by cutting programs for the aged.

The group, called the National Caucus and Center on Black Aged Inc., unanimously adopted a resolution that opposes a draft of the federal budget for fiscal 1986. The resolution contends that far too many of the proposed cuts are for programs that elderly blacks and other poor groups need.

"If these cuts are implemented, blacks will not only be stripped of economic benefits that they have earned over their working lives, but also their dignity," said Edward Cooper, 81, president of the Boston chapter of the caucus. "They will be forced to become beggars in a land of plenty."

Anna V. Brown, caucus vice chairwoman, said that the group plans to take its case to Congress to oppose program cuts that would adversely affect the elderly, black and white.

High on the list of the group's concerns are proposed cuts or spending freezes in Medicare, Medicaid, food stamps and federal retirement programs. Half of the nation's elderly blacks, they said, are poor or marginally poor, and program cuts would make their situation worse.

The caucus, which claims 30,000 members nationwide, maintains that reducing the budget should not be at the expense of the elderly.

"The pittance of an 8 percent cut in the Pentagon budget growth rate is only a subterfuge to do great harm to America's poor people," caucus cochairman Aaron Henry said in a prepared statement. "We of the NCBA plead with this administration not to perpetrate this cruel hoax upon the American older citizens."