The present invention provides a waterproof electric connector, including: first and second connectors configured such that first and second wire entry ends are provided at the first side ends of first and second housings; first and second packings configured to be inserted into the inner circumferences of the first and second wire entry ends; first and second finishing caps formed as blocking components which are coupled to the outer circumferences of the first and second wire entry ends; a coupling cap configured such that one side end thereof is coupled to the outer circumference of one side end of the second housing; and a connection packing part configured to include a first elastic packing and a second elastic packing.