The invention discloses a compound for a nanometer PET developer. The compound A is shown in the structural formula (I). The compound A is a small molecule and can undergo a condensation reaction under the action of furin to produce a polymer large molecule. The polymer large molecule has good blood vessel and cell permeability, has a high uptake rate, can actively target an imaging zone, can self-assemble to form nanoparticles in the tumor zone, has high imaging sensitivity and good imaging effects, can be prepared simply, allows mild reaction conditions and can be used for high-expression furin tumor PET development.