The invention discloses an oscillator and a manufacturing method thereof. The manufacturing method comprises the steps of: S1, conducting injection moulding to obtain an oscillator body with a predetermined structure; S2, conducting mechanical roughening treatment on the surface of the oscillator body, and performing ultrasonic cleaning; S3, carrying out chemical nickel-plating on the oscillator body to form a chemical nickel layer on the surface of the oscillator body; S4, performing laser engraving on the chemical nickel layer to form a barrier line so as to separate an electroplating area and a non-electroplating area on the surface of the oscillator body; S5, conducting copper electroplating treatment to form a plated copper layer on the electroplating area of the oscillator body; S6,conducting chemical nickel removal treatment to remove the chemical nickel layer on the non-electroplating area of the oscillator body; and S7, conducting electrotinning treatment to form an electroplated tin layer on the plated copper layer, and performing tin protection treatment. The manufacturing method of the oscillator provided by the invention combines chemical plating with electroplating for coating, has the advantages of short time and low process cost compared with the all chemical plating way, and improves the production efficiency.