No, it is valid without a lawyer or notarization.

Related information: The validity of a written document depends on the authenticity of the written document (that is, the authenticity of its content) and the true meaning of the person who created the written document. Otherwise, it may be invalid or revocable.

Documentary evidence is not valid unless it has been notarized by a lawyer or notarized. Only if it has been notarized by a lawyer or notarized, its evidence has the highest probative effect. For this reason, Article 69 of my country’s Civil Procedure Law provides that “it has gone through legal procedures.” The legal facts and documents notarized and certified shall be used by the people's court as the basis for determining the facts, unless there is contrary evidence that is sufficient to overturn the notarized certification." For non-notarized documents, it is recommended that they be written, signed and clearly fingerprinted by the person who created the document. It will still be a valid document with legal effect.