1. A mini-antibody encoded by a nucleotide sequence containing from the N-terminus to the C-terminus: a scFv sequence that can bind to a prostate-specific membrane antigen (PSMA), said scFv sequence contains a heavy chain variable domain (VH) linked to variable domain light chain (VL) linker sequence； artificial hinge region； and the sequence of human CH3 IgG. 2. The mini-antibody of claim 1, further comprising an N-terminal signal sequence that facilitates secretion of said mini-antibody when expressed in a cell. The mini-antibody of claim 1, wherein the scFv is located in a ba) VHVL orientation so that VH is located against the direction of transcription from VL； or b) VLVH orientation so that VL is located opposite the direction of transcription from VH.4. The mini-antibody according to claim 3, wherein the nucleotide sequence contains) SEQ ID No: 1 or SEQ ID No: 2； b) when expressed in a cell, the specified nucleotide sequence forms an amino acid sequence, and the specified amino acid sequence corresponds to SEQ ID No: 10 or SEQ ID No: 11； or c) when expressed in a cell, said nucleotide sequence forms an amino acid sequence, and wherein said amino acid sequence comprises: a heavy chain variable domain corresponding to a heavy chain variable domain in SEQ ID NO: 10 and a light chain variable domain corresponding to a light chain variable domain in SEQ ID no: 10； or the variable domain of the heavy chain corresponding to the variable domain of the heavy chain in SEQ ID No: 11 and the variable domain of the light chain corresponding to the variable domain of the light chain1. Мини-антитело, кодируемое последовательностью нуклеотидов, содержащее от N-конца к С-концу:последовательность scFv, которая может связываться с простата-специфичным мембранным антигеном (PSMA), указанная последовательность scFv содержит вариабельный домен тяжелой цепи (VH), соединенный с вариабельным доменом легкой цепи (VL) линкерной последовательностью；искусственный шарнирный участок； ипосле
